xfrm_user.c 57.9 KB
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/* xfrm_user.c: User interface to configure xfrm engine.
 *
 * Copyright (C) 2002 David S. Miller (davem@redhat.com)
 *
 * Changes:
 *	Mitsuru KANDA @USAGI
 * 	Kazunori MIYAZAWA @USAGI
 * 	Kunihiro Ishiguro <kunihiro@ipinfusion.com>
 * 		IPv6 support
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 *
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 */

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#include <linux/crypto.h>
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#include <linux/module.h>
#include <linux/kernel.h>
#include <linux/types.h>
#include <linux/slab.h>
#include <linux/socket.h>
#include <linux/string.h>
#include <linux/net.h>
#include <linux/skbuff.h>
#include <linux/rtnetlink.h>
#include <linux/pfkeyv2.h>
#include <linux/ipsec.h>
#include <linux/init.h>
#include <linux/security.h>
#include <net/sock.h>
#include <net/xfrm.h>
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#include <net/netlink.h>
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#include <asm/uaccess.h>
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#if defined(CONFIG_IPV6) || defined(CONFIG_IPV6_MODULE)
#include <linux/in6.h>
#endif
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#include <linux/audit.h>
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static int verify_one_alg(struct rtattr **xfrma, enum xfrm_attr_type_t type)
{
	struct rtattr *rt = xfrma[type - 1];
	struct xfrm_algo *algp;
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	int len;
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	if (!rt)
		return 0;

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	len = (rt->rta_len - sizeof(*rt)) - sizeof(*algp);
	if (len < 0)
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		return -EINVAL;

	algp = RTA_DATA(rt);
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	len -= (algp->alg_key_len + 7U) / 8;
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	if (len < 0)
		return -EINVAL;

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	switch (type) {
	case XFRMA_ALG_AUTH:
		if (!algp->alg_key_len &&
		    strcmp(algp->alg_name, "digest_null") != 0)
			return -EINVAL;
		break;

	case XFRMA_ALG_CRYPT:
		if (!algp->alg_key_len &&
		    strcmp(algp->alg_name, "cipher_null") != 0)
			return -EINVAL;
		break;

	case XFRMA_ALG_COMP:
		/* Zero length keys are legal.  */
		break;

	default:
		return -EINVAL;
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	}
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	algp->alg_name[CRYPTO_MAX_ALG_NAME - 1] = '\0';
	return 0;
}

static int verify_encap_tmpl(struct rtattr **xfrma)
{
	struct rtattr *rt = xfrma[XFRMA_ENCAP - 1];
	struct xfrm_encap_tmpl *encap;

	if (!rt)
		return 0;

	if ((rt->rta_len - sizeof(*rt)) < sizeof(*encap))
		return -EINVAL;

	return 0;
}

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static int verify_one_addr(struct rtattr **xfrma, enum xfrm_attr_type_t type,
			   xfrm_address_t **addrp)
{
	struct rtattr *rt = xfrma[type - 1];

	if (!rt)
		return 0;

	if ((rt->rta_len - sizeof(*rt)) < sizeof(**addrp))
		return -EINVAL;

	if (addrp)
		*addrp = RTA_DATA(rt);

	return 0;
}
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static inline int verify_sec_ctx_len(struct rtattr **xfrma)
{
	struct rtattr *rt = xfrma[XFRMA_SEC_CTX - 1];
	struct xfrm_user_sec_ctx *uctx;
	int len = 0;

	if (!rt)
		return 0;

	if (rt->rta_len < sizeof(*uctx))
		return -EINVAL;

	uctx = RTA_DATA(rt);

	len += sizeof(struct xfrm_user_sec_ctx);
	len += uctx->ctx_len;

	if (uctx->len != len)
		return -EINVAL;

	return 0;
}


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static int verify_newsa_info(struct xfrm_usersa_info *p,
			     struct rtattr **xfrma)
{
	int err;

	err = -EINVAL;
	switch (p->family) {
	case AF_INET:
		break;

	case AF_INET6:
#if defined(CONFIG_IPV6) || defined(CONFIG_IPV6_MODULE)
		break;
#else
		err = -EAFNOSUPPORT;
		goto out;
#endif

	default:
		goto out;
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	}
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	err = -EINVAL;
	switch (p->id.proto) {
	case IPPROTO_AH:
		if (!xfrma[XFRMA_ALG_AUTH-1]	||
		    xfrma[XFRMA_ALG_CRYPT-1]	||
		    xfrma[XFRMA_ALG_COMP-1])
			goto out;
		break;

	case IPPROTO_ESP:
		if ((!xfrma[XFRMA_ALG_AUTH-1] &&
		     !xfrma[XFRMA_ALG_CRYPT-1])	||
		    xfrma[XFRMA_ALG_COMP-1])
			goto out;
		break;

	case IPPROTO_COMP:
		if (!xfrma[XFRMA_ALG_COMP-1]	||
		    xfrma[XFRMA_ALG_AUTH-1]	||
		    xfrma[XFRMA_ALG_CRYPT-1])
			goto out;
		break;

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#if defined(CONFIG_IPV6) || defined(CONFIG_IPV6_MODULE)
	case IPPROTO_DSTOPTS:
	case IPPROTO_ROUTING:
		if (xfrma[XFRMA_ALG_COMP-1]	||
		    xfrma[XFRMA_ALG_AUTH-1]	||
		    xfrma[XFRMA_ALG_CRYPT-1]	||
		    xfrma[XFRMA_ENCAP-1]	||
		    xfrma[XFRMA_SEC_CTX-1]	||
		    !xfrma[XFRMA_COADDR-1])
			goto out;
		break;
#endif

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	default:
		goto out;
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	}
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	if ((err = verify_one_alg(xfrma, XFRMA_ALG_AUTH)))
		goto out;
	if ((err = verify_one_alg(xfrma, XFRMA_ALG_CRYPT)))
		goto out;
	if ((err = verify_one_alg(xfrma, XFRMA_ALG_COMP)))
		goto out;
	if ((err = verify_encap_tmpl(xfrma)))
		goto out;
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	if ((err = verify_sec_ctx_len(xfrma)))
		goto out;
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	if ((err = verify_one_addr(xfrma, XFRMA_COADDR, NULL)))
		goto out;
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	err = -EINVAL;
	switch (p->mode) {
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	case XFRM_MODE_TRANSPORT:
	case XFRM_MODE_TUNNEL:
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	case XFRM_MODE_ROUTEOPTIMIZATION:
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	case XFRM_MODE_BEET:
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		break;

	default:
		goto out;
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	}
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	err = 0;

out:
	return err;
}

static int attach_one_algo(struct xfrm_algo **algpp, u8 *props,
			   struct xfrm_algo_desc *(*get_byname)(char *, int),
			   struct rtattr *u_arg)
{
	struct rtattr *rta = u_arg;
	struct xfrm_algo *p, *ualg;
	struct xfrm_algo_desc *algo;
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	int len;
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	if (!rta)
		return 0;

	ualg = RTA_DATA(rta);

	algo = get_byname(ualg->alg_name, 1);
	if (!algo)
		return -ENOSYS;
	*props = algo->desc.sadb_alg_id;

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	len = sizeof(*ualg) + (ualg->alg_key_len + 7U) / 8;
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	p = kmemdup(ualg, len, GFP_KERNEL);
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	if (!p)
		return -ENOMEM;

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	strcpy(p->alg_name, algo->name);
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	*algpp = p;
	return 0;
}

static int attach_encap_tmpl(struct xfrm_encap_tmpl **encapp, struct rtattr *u_arg)
{
	struct rtattr *rta = u_arg;
	struct xfrm_encap_tmpl *p, *uencap;

	if (!rta)
		return 0;

	uencap = RTA_DATA(rta);
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	p = kmemdup(uencap, sizeof(*p), GFP_KERNEL);
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	if (!p)
		return -ENOMEM;

	*encapp = p;
	return 0;
}

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static inline int xfrm_user_sec_ctx_size(struct xfrm_sec_ctx *xfrm_ctx)
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{
	int len = 0;

	if (xfrm_ctx) {
		len += sizeof(struct xfrm_user_sec_ctx);
		len += xfrm_ctx->ctx_len;
	}
	return len;
}

static int attach_sec_ctx(struct xfrm_state *x, struct rtattr *u_arg)
{
	struct xfrm_user_sec_ctx *uctx;

	if (!u_arg)
		return 0;

	uctx = RTA_DATA(u_arg);
	return security_xfrm_state_alloc(x, uctx);
}

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static int attach_one_addr(xfrm_address_t **addrpp, struct rtattr *u_arg)
{
	struct rtattr *rta = u_arg;
	xfrm_address_t *p, *uaddrp;

	if (!rta)
		return 0;

	uaddrp = RTA_DATA(rta);
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	p = kmemdup(uaddrp, sizeof(*p), GFP_KERNEL);
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	if (!p)
		return -ENOMEM;

	*addrpp = p;
	return 0;
}

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static void copy_from_user_state(struct xfrm_state *x, struct xfrm_usersa_info *p)
{
	memcpy(&x->id, &p->id, sizeof(x->id));
	memcpy(&x->sel, &p->sel, sizeof(x->sel));
	memcpy(&x->lft, &p->lft, sizeof(x->lft));
	x->props.mode = p->mode;
	x->props.replay_window = p->replay_window;
	x->props.reqid = p->reqid;
	x->props.family = p->family;
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	memcpy(&x->props.saddr, &p->saddr, sizeof(x->props.saddr));
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	x->props.flags = p->flags;
}

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/*
 * someday when pfkey also has support, we could have the code
 * somehow made shareable and move it to xfrm_state.c - JHS
 *
*/
static int xfrm_update_ae_params(struct xfrm_state *x, struct rtattr **xfrma)
{
	int err = - EINVAL;
	struct rtattr *rp = xfrma[XFRMA_REPLAY_VAL-1];
	struct rtattr *lt = xfrma[XFRMA_LTIME_VAL-1];
	struct rtattr *et = xfrma[XFRMA_ETIMER_THRESH-1];
	struct rtattr *rt = xfrma[XFRMA_REPLAY_THRESH-1];

	if (rp) {
		struct xfrm_replay_state *replay;
		if (RTA_PAYLOAD(rp) < sizeof(*replay))
			goto error;
		replay = RTA_DATA(rp);
		memcpy(&x->replay, replay, sizeof(*replay));
		memcpy(&x->preplay, replay, sizeof(*replay));
	}

	if (lt) {
		struct xfrm_lifetime_cur *ltime;
		if (RTA_PAYLOAD(lt) < sizeof(*ltime))
			goto error;
		ltime = RTA_DATA(lt);
		x->curlft.bytes = ltime->bytes;
		x->curlft.packets = ltime->packets;
		x->curlft.add_time = ltime->add_time;
		x->curlft.use_time = ltime->use_time;
	}

	if (et) {
		if (RTA_PAYLOAD(et) < sizeof(u32))
			goto error;
		x->replay_maxage = *(u32*)RTA_DATA(et);
	}

	if (rt) {
		if (RTA_PAYLOAD(rt) < sizeof(u32))
			goto error;
		x->replay_maxdiff = *(u32*)RTA_DATA(rt);
	}

	return 0;
error:
	return err;
}

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static struct xfrm_state *xfrm_state_construct(struct xfrm_usersa_info *p,
					       struct rtattr **xfrma,
					       int *errp)
{
	struct xfrm_state *x = xfrm_state_alloc();
	int err = -ENOMEM;

	if (!x)
		goto error_no_put;

	copy_from_user_state(x, p);

	if ((err = attach_one_algo(&x->aalg, &x->props.aalgo,
				   xfrm_aalg_get_byname,
				   xfrma[XFRMA_ALG_AUTH-1])))
		goto error;
	if ((err = attach_one_algo(&x->ealg, &x->props.ealgo,
				   xfrm_ealg_get_byname,
				   xfrma[XFRMA_ALG_CRYPT-1])))
		goto error;
	if ((err = attach_one_algo(&x->calg, &x->props.calgo,
				   xfrm_calg_get_byname,
				   xfrma[XFRMA_ALG_COMP-1])))
		goto error;
	if ((err = attach_encap_tmpl(&x->encap, xfrma[XFRMA_ENCAP-1])))
		goto error;
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	if ((err = attach_one_addr(&x->coaddr, xfrma[XFRMA_COADDR-1])))
		goto error;
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	err = xfrm_init_state(x);
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	if (err)
		goto error;

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	if ((err = attach_sec_ctx(x, xfrma[XFRMA_SEC_CTX-1])))
		goto error;

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	x->km.seq = p->seq;
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	x->replay_maxdiff = sysctl_xfrm_aevent_rseqth;
	/* sysctl_xfrm_aevent_etime is in 100ms units */
	x->replay_maxage = (sysctl_xfrm_aevent_etime*HZ)/XFRM_AE_ETH_M;
	x->preplay.bitmap = 0;
	x->preplay.seq = x->replay.seq+x->replay_maxdiff;
	x->preplay.oseq = x->replay.oseq +x->replay_maxdiff;

	/* override default values from above */

	err = xfrm_update_ae_params(x, (struct rtattr **)xfrma);
	if (err	< 0)
		goto error;
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	return x;

error:
	x->km.state = XFRM_STATE_DEAD;
	xfrm_state_put(x);
error_no_put:
	*errp = err;
	return NULL;
}

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static int xfrm_add_sa(struct sk_buff *skb, struct nlmsghdr *nlh,
		struct rtattr **xfrma)
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{
	struct xfrm_usersa_info *p = NLMSG_DATA(nlh);
	struct xfrm_state *x;
	int err;
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	struct km_event c;
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	err = verify_newsa_info(p, xfrma);
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	if (err)
		return err;

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	x = xfrm_state_construct(p, xfrma, &err);
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	if (!x)
		return err;

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	xfrm_state_hold(x);
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	if (nlh->nlmsg_type == XFRM_MSG_NEWSA)
		err = xfrm_state_add(x);
	else
		err = xfrm_state_update(x);

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	xfrm_audit_log(NETLINK_CB(skb).loginuid, NETLINK_CB(skb).sid,
		       AUDIT_MAC_IPSEC_ADDSA, err ? 0 : 1, NULL, x);

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	if (err < 0) {
		x->km.state = XFRM_STATE_DEAD;
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		__xfrm_state_put(x);
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		goto out;
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	}

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	c.seq = nlh->nlmsg_seq;
	c.pid = nlh->nlmsg_pid;
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	c.event = nlh->nlmsg_type;
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	km_state_notify(x, &c);
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out:
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	xfrm_state_put(x);
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	return err;
}

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static struct xfrm_state *xfrm_user_state_lookup(struct xfrm_usersa_id *p,
						 struct rtattr **xfrma,
						 int *errp)
{
	struct xfrm_state *x = NULL;
	int err;

	if (xfrm_id_proto_match(p->proto, IPSEC_PROTO_ANY)) {
		err = -ESRCH;
		x = xfrm_state_lookup(&p->daddr, p->spi, p->proto, p->family);
	} else {
		xfrm_address_t *saddr = NULL;

		err = verify_one_addr(xfrma, XFRMA_SRCADDR, &saddr);
		if (err)
			goto out;

		if (!saddr) {
			err = -EINVAL;
			goto out;
		}

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		err = -ESRCH;
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		x = xfrm_state_lookup_byaddr(&p->daddr, saddr, p->proto,
					     p->family);
	}

 out:
	if (!x && errp)
		*errp = err;
	return x;
}

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static int xfrm_del_sa(struct sk_buff *skb, struct nlmsghdr *nlh,
		struct rtattr **xfrma)
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{
	struct xfrm_state *x;
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	int err = -ESRCH;
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	struct km_event c;
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	struct xfrm_usersa_id *p = NLMSG_DATA(nlh);

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	x = xfrm_user_state_lookup(p, xfrma, &err);
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	if (x == NULL)
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		return err;
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	if ((err = security_xfrm_state_delete(x)) != 0)
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		goto out;

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	if (xfrm_state_kern(x)) {
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		err = -EPERM;
		goto out;
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	}

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	err = xfrm_state_delete(x);
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	if (err < 0)
		goto out;
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	c.seq = nlh->nlmsg_seq;
	c.pid = nlh->nlmsg_pid;
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	c.event = nlh->nlmsg_type;
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	km_state_notify(x, &c);
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out:
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	xfrm_audit_log(NETLINK_CB(skb).loginuid, NETLINK_CB(skb).sid,
		       AUDIT_MAC_IPSEC_DELSA, err ? 0 : 1, NULL, x);
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	xfrm_state_put(x);
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	return err;
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}

static void copy_to_user_state(struct xfrm_state *x, struct xfrm_usersa_info *p)
{
	memcpy(&p->id, &x->id, sizeof(p->id));
	memcpy(&p->sel, &x->sel, sizeof(p->sel));
	memcpy(&p->lft, &x->lft, sizeof(p->lft));
	memcpy(&p->curlft, &x->curlft, sizeof(p->curlft));
	memcpy(&p->stats, &x->stats, sizeof(p->stats));
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	memcpy(&p->saddr, &x->props.saddr, sizeof(p->saddr));
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	p->mode = x->props.mode;
	p->replay_window = x->props.replay_window;
	p->reqid = x->props.reqid;
	p->family = x->props.family;
	p->flags = x->props.flags;
	p->seq = x->km.seq;
}

struct xfrm_dump_info {
	struct sk_buff *in_skb;
	struct sk_buff *out_skb;
	u32 nlmsg_seq;
	u16 nlmsg_flags;
	int start_idx;
	int this_idx;
};

static int dump_one_state(struct xfrm_state *x, int count, void *ptr)
{
	struct xfrm_dump_info *sp = ptr;
	struct sk_buff *in_skb = sp->in_skb;
	struct sk_buff *skb = sp->out_skb;
	struct xfrm_usersa_info *p;
	struct nlmsghdr *nlh;
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	unsigned char *b = skb_tail_pointer(skb);
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	if (sp->this_idx < sp->start_idx)
		goto out;

	nlh = NLMSG_PUT(skb, NETLINK_CB(in_skb).pid,
			sp->nlmsg_seq,
			XFRM_MSG_NEWSA, sizeof(*p));
	nlh->nlmsg_flags = sp->nlmsg_flags;

	p = NLMSG_DATA(nlh);
	copy_to_user_state(x, p);

	if (x->aalg)
		RTA_PUT(skb, XFRMA_ALG_AUTH,
			sizeof(*(x->aalg))+(x->aalg->alg_key_len+7)/8, x->aalg);
	if (x->ealg)
		RTA_PUT(skb, XFRMA_ALG_CRYPT,
			sizeof(*(x->ealg))+(x->ealg->alg_key_len+7)/8, x->ealg);
	if (x->calg)
		RTA_PUT(skb, XFRMA_ALG_COMP, sizeof(*(x->calg)), x->calg);

	if (x->encap)
		RTA_PUT(skb, XFRMA_ENCAP, sizeof(*x->encap), x->encap);

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	if (x->security) {
		int ctx_size = sizeof(struct xfrm_sec_ctx) +
				x->security->ctx_len;
		struct rtattr *rt = __RTA_PUT(skb, XFRMA_SEC_CTX, ctx_size);
		struct xfrm_user_sec_ctx *uctx = RTA_DATA(rt);

		uctx->exttype = XFRMA_SEC_CTX;
		uctx->len = ctx_size;
		uctx->ctx_doi = x->security->ctx_doi;
		uctx->ctx_alg = x->security->ctx_alg;
		uctx->ctx_len = x->security->ctx_len;
		memcpy(uctx + 1, x->security->ctx_str, x->security->ctx_len);
	}
617 618 619 620

	if (x->coaddr)
		RTA_PUT(skb, XFRMA_COADDR, sizeof(*x->coaddr), x->coaddr);

621 622 623
	if (x->lastused)
		RTA_PUT(skb, XFRMA_LASTUSED, sizeof(x->lastused), &x->lastused);

624
	nlh->nlmsg_len = skb_tail_pointer(skb) - b;
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out:
	sp->this_idx++;
	return 0;

nlmsg_failure:
rtattr_failure:
631
	nlmsg_trim(skb, b);
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	return -1;
}

static int xfrm_dump_sa(struct sk_buff *skb, struct netlink_callback *cb)
{
	struct xfrm_dump_info info;

	info.in_skb = cb->skb;
	info.out_skb = skb;
	info.nlmsg_seq = cb->nlh->nlmsg_seq;
	info.nlmsg_flags = NLM_F_MULTI;
	info.this_idx = 0;
	info.start_idx = cb->args[0];
645
	(void) xfrm_state_walk(0, dump_one_state, &info);
L
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	cb->args[0] = info.this_idx;

	return skb->len;
}

static struct sk_buff *xfrm_state_netlink(struct sk_buff *in_skb,
					  struct xfrm_state *x, u32 seq)
{
	struct xfrm_dump_info info;
	struct sk_buff *skb;

	skb = alloc_skb(NLMSG_GOODSIZE, GFP_ATOMIC);
	if (!skb)
		return ERR_PTR(-ENOMEM);

	info.in_skb = in_skb;
	info.out_skb = skb;
	info.nlmsg_seq = seq;
	info.nlmsg_flags = 0;
	info.this_idx = info.start_idx = 0;

	if (dump_one_state(x, 0, &info)) {
		kfree_skb(skb);
		return NULL;
	}

	return skb;
}

J
Jamal Hadi Salim 已提交
675 676
static int build_spdinfo(struct sk_buff *skb, u32 pid, u32 seq, u32 flags)
{
677 678 679
	struct xfrmk_spdinfo si;
	struct xfrmu_spdinfo spc;
	struct xfrmu_spdhinfo sph;
J
Jamal Hadi Salim 已提交
680 681 682 683 684 685 686 687 688 689
	struct nlmsghdr *nlh;
	u32 *f;

	nlh = nlmsg_put(skb, pid, seq, XFRM_MSG_NEWSPDINFO, sizeof(u32), 0);
	if (nlh == NULL) /* shouldnt really happen ... */
		return -EMSGSIZE;

	f = nlmsg_data(nlh);
	*f = flags;
	xfrm_spd_getinfo(&si);
690 691 692 693 694 695 696 697 698 699 700
	spc.incnt = si.incnt;
	spc.outcnt = si.outcnt;
	spc.fwdcnt = si.fwdcnt;
	spc.inscnt = si.inscnt;
	spc.outscnt = si.outscnt;
	spc.fwdscnt = si.fwdscnt;
	sph.spdhcnt = si.spdhcnt;
	sph.spdhmcnt = si.spdhmcnt;

	NLA_PUT(skb, XFRMA_SPD_INFO, sizeof(spc), &spc);
	NLA_PUT(skb, XFRMA_SPD_HINFO, sizeof(sph), &sph);
J
Jamal Hadi Salim 已提交
701 702 703 704 705 706 707 708 709 710 711 712 713 714 715 716 717

	return nlmsg_end(skb, nlh);

nla_put_failure:
	nlmsg_cancel(skb, nlh);
	return -EMSGSIZE;
}

static int xfrm_get_spdinfo(struct sk_buff *skb, struct nlmsghdr *nlh,
		struct rtattr **xfrma)
{
	struct sk_buff *r_skb;
	u32 *flags = NLMSG_DATA(nlh);
	u32 spid = NETLINK_CB(skb).pid;
	u32 seq = nlh->nlmsg_seq;
	int len = NLMSG_LENGTH(sizeof(u32));

718 719
	len += RTA_SPACE(sizeof(struct xfrmu_spdinfo));
	len += RTA_SPACE(sizeof(struct xfrmu_spdhinfo));
J
Jamal Hadi Salim 已提交
720 721 722 723 724 725 726 727 728 729 730

	r_skb = alloc_skb(len, GFP_ATOMIC);
	if (r_skb == NULL)
		return -ENOMEM;

	if (build_spdinfo(r_skb, spid, seq, *flags) < 0)
		BUG();

	return nlmsg_unicast(xfrm_nl, r_skb, spid);
}

J
Jamal Hadi Salim 已提交
731 732
static int build_sadinfo(struct sk_buff *skb, u32 pid, u32 seq, u32 flags)
{
733 734
	struct xfrmk_sadinfo si;
	struct xfrmu_sadhinfo sh;
J
Jamal Hadi Salim 已提交
735 736 737 738 739 740 741 742 743 744 745
	struct nlmsghdr *nlh;
	u32 *f;

	nlh = nlmsg_put(skb, pid, seq, XFRM_MSG_NEWSADINFO, sizeof(u32), 0);
	if (nlh == NULL) /* shouldnt really happen ... */
		return -EMSGSIZE;

	f = nlmsg_data(nlh);
	*f = flags;
	xfrm_sad_getinfo(&si);

746 747 748 749 750
	sh.sadhmcnt = si.sadhmcnt;
	sh.sadhcnt = si.sadhcnt;

	NLA_PUT_U32(skb, XFRMA_SAD_CNT, si.sadcnt);
	NLA_PUT(skb, XFRMA_SAD_HINFO, sizeof(sh), &sh);
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	return nlmsg_end(skb, nlh);

nla_put_failure:
	nlmsg_cancel(skb, nlh);
	return -EMSGSIZE;
}

static int xfrm_get_sadinfo(struct sk_buff *skb, struct nlmsghdr *nlh,
		struct rtattr **xfrma)
{
	struct sk_buff *r_skb;
	u32 *flags = NLMSG_DATA(nlh);
	u32 spid = NETLINK_CB(skb).pid;
	u32 seq = nlh->nlmsg_seq;
	int len = NLMSG_LENGTH(sizeof(u32));

768 769
	len += RTA_SPACE(sizeof(struct xfrmu_sadhinfo));
	len += RTA_SPACE(sizeof(u32));
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Jamal Hadi Salim 已提交
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	r_skb = alloc_skb(len, GFP_ATOMIC);

	if (r_skb == NULL)
		return -ENOMEM;

	if (build_sadinfo(r_skb, spid, seq, *flags) < 0)
		BUG();

	return nlmsg_unicast(xfrm_nl, r_skb, spid);
}

782 783
static int xfrm_get_sa(struct sk_buff *skb, struct nlmsghdr *nlh,
		struct rtattr **xfrma)
L
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784 785 786 787
{
	struct xfrm_usersa_id *p = NLMSG_DATA(nlh);
	struct xfrm_state *x;
	struct sk_buff *resp_skb;
788
	int err = -ESRCH;
L
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789

790
	x = xfrm_user_state_lookup(p, xfrma, &err);
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	if (x == NULL)
		goto out_noput;

	resp_skb = xfrm_state_netlink(skb, x, nlh->nlmsg_seq);
	if (IS_ERR(resp_skb)) {
		err = PTR_ERR(resp_skb);
	} else {
		err = netlink_unicast(xfrm_nl, resp_skb,
				      NETLINK_CB(skb).pid, MSG_DONTWAIT);
	}
	xfrm_state_put(x);
out_noput:
	return err;
}

static int verify_userspi_info(struct xfrm_userspi_info *p)
{
	switch (p->info.id.proto) {
	case IPPROTO_AH:
	case IPPROTO_ESP:
		break;

	case IPPROTO_COMP:
		/* IPCOMP spi is 16-bits. */
		if (p->max >= 0x10000)
			return -EINVAL;
		break;

	default:
		return -EINVAL;
821
	}
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822 823 824 825 826 827 828

	if (p->min > p->max)
		return -EINVAL;

	return 0;
}

829 830
static int xfrm_alloc_userspi(struct sk_buff *skb, struct nlmsghdr *nlh,
		struct rtattr **xfrma)
L
Linus Torvalds 已提交
831 832 833 834 835 836 837 838 839 840 841 842 843 844 845 846 847 848 849 850 851 852 853 854 855 856 857 858 859 860 861 862 863 864 865 866 867 868 869 870 871 872 873 874 875 876 877 878 879 880 881 882 883 884 885 886 887 888
{
	struct xfrm_state *x;
	struct xfrm_userspi_info *p;
	struct sk_buff *resp_skb;
	xfrm_address_t *daddr;
	int family;
	int err;

	p = NLMSG_DATA(nlh);
	err = verify_userspi_info(p);
	if (err)
		goto out_noput;

	family = p->info.family;
	daddr = &p->info.id.daddr;

	x = NULL;
	if (p->info.seq) {
		x = xfrm_find_acq_byseq(p->info.seq);
		if (x && xfrm_addr_cmp(&x->id.daddr, daddr, family)) {
			xfrm_state_put(x);
			x = NULL;
		}
	}

	if (!x)
		x = xfrm_find_acq(p->info.mode, p->info.reqid,
				  p->info.id.proto, daddr,
				  &p->info.saddr, 1,
				  family);
	err = -ENOENT;
	if (x == NULL)
		goto out_noput;

	resp_skb = ERR_PTR(-ENOENT);

	spin_lock_bh(&x->lock);
	if (x->km.state != XFRM_STATE_DEAD) {
		xfrm_alloc_spi(x, htonl(p->min), htonl(p->max));
		if (x->id.spi)
			resp_skb = xfrm_state_netlink(skb, x, nlh->nlmsg_seq);
	}
	spin_unlock_bh(&x->lock);

	if (IS_ERR(resp_skb)) {
		err = PTR_ERR(resp_skb);
		goto out;
	}

	err = netlink_unicast(xfrm_nl, resp_skb,
			      NETLINK_CB(skb).pid, MSG_DONTWAIT);

out:
	xfrm_state_put(x);
out_noput:
	return err;
}

889
static int verify_policy_dir(u8 dir)
L
Linus Torvalds 已提交
890 891 892 893 894 895 896 897 898
{
	switch (dir) {
	case XFRM_POLICY_IN:
	case XFRM_POLICY_OUT:
	case XFRM_POLICY_FWD:
		break;

	default:
		return -EINVAL;
899
	}
L
Linus Torvalds 已提交
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	return 0;
}

904
static int verify_policy_type(u8 type)
905 906 907 908 909 910 911 912 913 914
{
	switch (type) {
	case XFRM_POLICY_TYPE_MAIN:
#ifdef CONFIG_XFRM_SUB_POLICY
	case XFRM_POLICY_TYPE_SUB:
#endif
		break;

	default:
		return -EINVAL;
915
	}
916 917 918 919

	return 0;
}

L
Linus Torvalds 已提交
920 921 922 923 924 925 926 927 928 929 930
static int verify_newpolicy_info(struct xfrm_userpolicy_info *p)
{
	switch (p->share) {
	case XFRM_SHARE_ANY:
	case XFRM_SHARE_SESSION:
	case XFRM_SHARE_USER:
	case XFRM_SHARE_UNIQUE:
		break;

	default:
		return -EINVAL;
931
	}
L
Linus Torvalds 已提交
932 933 934 935 936 937 938 939

	switch (p->action) {
	case XFRM_POLICY_ALLOW:
	case XFRM_POLICY_BLOCK:
		break;

	default:
		return -EINVAL;
940
	}
L
Linus Torvalds 已提交
941 942 943 944 945 946 947 948 949 950 951 952 953 954

	switch (p->sel.family) {
	case AF_INET:
		break;

	case AF_INET6:
#if defined(CONFIG_IPV6) || defined(CONFIG_IPV6_MODULE)
		break;
#else
		return  -EAFNOSUPPORT;
#endif

	default:
		return -EINVAL;
955
	}
L
Linus Torvalds 已提交
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	return verify_policy_dir(p->dir);
}

960 961 962 963 964 965 966 967 968 969 970 971
static int copy_from_user_sec_ctx(struct xfrm_policy *pol, struct rtattr **xfrma)
{
	struct rtattr *rt = xfrma[XFRMA_SEC_CTX-1];
	struct xfrm_user_sec_ctx *uctx;

	if (!rt)
		return 0;

	uctx = RTA_DATA(rt);
	return security_xfrm_policy_alloc(pol, uctx);
}

L
Linus Torvalds 已提交
972 973 974 975 976 977 978 979 980 981 982 983 984 985 986 987 988 989 990
static void copy_templates(struct xfrm_policy *xp, struct xfrm_user_tmpl *ut,
			   int nr)
{
	int i;

	xp->xfrm_nr = nr;
	for (i = 0; i < nr; i++, ut++) {
		struct xfrm_tmpl *t = &xp->xfrm_vec[i];

		memcpy(&t->id, &ut->id, sizeof(struct xfrm_id));
		memcpy(&t->saddr, &ut->saddr,
		       sizeof(xfrm_address_t));
		t->reqid = ut->reqid;
		t->mode = ut->mode;
		t->share = ut->share;
		t->optional = ut->optional;
		t->aalgos = ut->aalgos;
		t->ealgos = ut->ealgos;
		t->calgos = ut->calgos;
991
		t->encap_family = ut->family;
L
Linus Torvalds 已提交
992 993 994
	}
}

995 996 997 998 999 1000 1001 1002 1003 1004 1005 1006 1007 1008 1009 1010 1011 1012 1013 1014 1015 1016 1017 1018 1019 1020 1021
static int validate_tmpl(int nr, struct xfrm_user_tmpl *ut, u16 family)
{
	int i;

	if (nr > XFRM_MAX_DEPTH)
		return -EINVAL;

	for (i = 0; i < nr; i++) {
		/* We never validated the ut->family value, so many
		 * applications simply leave it at zero.  The check was
		 * never made and ut->family was ignored because all
		 * templates could be assumed to have the same family as
		 * the policy itself.  Now that we will have ipv4-in-ipv6
		 * and ipv6-in-ipv4 tunnels, this is no longer true.
		 */
		if (!ut[i].family)
			ut[i].family = family;

		switch (ut[i].family) {
		case AF_INET:
			break;
#if defined(CONFIG_IPV6) || defined(CONFIG_IPV6_MODULE)
		case AF_INET6:
			break;
#endif
		default:
			return -EINVAL;
1022
		}
1023 1024 1025 1026 1027
	}

	return 0;
}

L
Linus Torvalds 已提交
1028 1029 1030 1031 1032 1033 1034
static int copy_from_user_tmpl(struct xfrm_policy *pol, struct rtattr **xfrma)
{
	struct rtattr *rt = xfrma[XFRMA_TMPL-1];

	if (!rt) {
		pol->xfrm_nr = 0;
	} else {
1035 1036 1037
		struct xfrm_user_tmpl *utmpl = RTA_DATA(rt);
		int nr = (rt->rta_len - sizeof(*rt)) / sizeof(*utmpl);
		int err;
L
Linus Torvalds 已提交
1038

1039 1040 1041
		err = validate_tmpl(nr, utmpl, pol->family);
		if (err)
			return err;
L
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1042 1043 1044 1045 1046 1047

		copy_templates(pol, RTA_DATA(rt), nr);
	}
	return 0;
}

1048 1049 1050 1051
static int copy_from_user_policy_type(u8 *tp, struct rtattr **xfrma)
{
	struct rtattr *rt = xfrma[XFRMA_POLICY_TYPE-1];
	struct xfrm_userpolicy_type *upt;
1052
	u8 type = XFRM_POLICY_TYPE_MAIN;
1053 1054 1055 1056 1057 1058 1059 1060 1061 1062 1063 1064 1065 1066 1067 1068 1069 1070
	int err;

	if (rt) {
		if (rt->rta_len < sizeof(*upt))
			return -EINVAL;

		upt = RTA_DATA(rt);
		type = upt->type;
	}

	err = verify_policy_type(type);
	if (err)
		return err;

	*tp = type;
	return 0;
}

L
Linus Torvalds 已提交
1071 1072 1073 1074 1075 1076 1077 1078 1079 1080 1081 1082 1083 1084 1085 1086 1087 1088 1089 1090 1091 1092 1093 1094 1095 1096 1097 1098 1099 1100 1101 1102 1103 1104 1105 1106 1107
static void copy_from_user_policy(struct xfrm_policy *xp, struct xfrm_userpolicy_info *p)
{
	xp->priority = p->priority;
	xp->index = p->index;
	memcpy(&xp->selector, &p->sel, sizeof(xp->selector));
	memcpy(&xp->lft, &p->lft, sizeof(xp->lft));
	xp->action = p->action;
	xp->flags = p->flags;
	xp->family = p->sel.family;
	/* XXX xp->share = p->share; */
}

static void copy_to_user_policy(struct xfrm_policy *xp, struct xfrm_userpolicy_info *p, int dir)
{
	memcpy(&p->sel, &xp->selector, sizeof(p->sel));
	memcpy(&p->lft, &xp->lft, sizeof(p->lft));
	memcpy(&p->curlft, &xp->curlft, sizeof(p->curlft));
	p->priority = xp->priority;
	p->index = xp->index;
	p->sel.family = xp->family;
	p->dir = dir;
	p->action = xp->action;
	p->flags = xp->flags;
	p->share = XFRM_SHARE_ANY; /* XXX xp->share */
}

static struct xfrm_policy *xfrm_policy_construct(struct xfrm_userpolicy_info *p, struct rtattr **xfrma, int *errp)
{
	struct xfrm_policy *xp = xfrm_policy_alloc(GFP_KERNEL);
	int err;

	if (!xp) {
		*errp = -ENOMEM;
		return NULL;
	}

	copy_from_user_policy(xp, p);
1108

1109 1110 1111 1112
	err = copy_from_user_policy_type(&xp->type, xfrma);
	if (err)
		goto error;

1113 1114
	if (!(err = copy_from_user_tmpl(xp, xfrma)))
		err = copy_from_user_sec_ctx(xp, xfrma);
1115 1116
	if (err)
		goto error;
L
Linus Torvalds 已提交
1117 1118

	return xp;
1119 1120 1121 1122
 error:
	*errp = err;
	kfree(xp);
	return NULL;
L
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}

1125 1126
static int xfrm_add_policy(struct sk_buff *skb, struct nlmsghdr *nlh,
		struct rtattr **xfrma)
L
Linus Torvalds 已提交
1127 1128 1129
{
	struct xfrm_userpolicy_info *p = NLMSG_DATA(nlh);
	struct xfrm_policy *xp;
1130
	struct km_event c;
L
Linus Torvalds 已提交
1131 1132 1133 1134
	int err;
	int excl;

	err = verify_newpolicy_info(p);
1135 1136
	if (err)
		return err;
1137
	err = verify_sec_ctx_len(xfrma);
L
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	if (err)
		return err;

1141
	xp = xfrm_policy_construct(p, xfrma, &err);
L
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1142 1143 1144
	if (!xp)
		return err;

1145 1146 1147 1148
	/* shouldnt excl be based on nlh flags??
	 * Aha! this is anti-netlink really i.e  more pfkey derived
	 * in netlink excl is a flag and you wouldnt need
	 * a type XFRM_MSG_UPDPOLICY - JHS */
L
Linus Torvalds 已提交
1149 1150
	excl = nlh->nlmsg_type == XFRM_MSG_NEWPOLICY;
	err = xfrm_policy_insert(p->dir, xp, excl);
J
Joy Latten 已提交
1151 1152 1153
	xfrm_audit_log(NETLINK_CB(skb).loginuid, NETLINK_CB(skb).sid,
		       AUDIT_MAC_IPSEC_DELSPD, err ? 0 : 1, xp, NULL);

L
Linus Torvalds 已提交
1154
	if (err) {
1155
		security_xfrm_policy_free(xp);
L
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1156 1157 1158 1159
		kfree(xp);
		return err;
	}

1160
	c.event = nlh->nlmsg_type;
1161 1162 1163 1164
	c.seq = nlh->nlmsg_seq;
	c.pid = nlh->nlmsg_pid;
	km_policy_notify(xp, p->dir, &c);

L
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1165 1166 1167 1168 1169 1170 1171 1172 1173 1174 1175 1176 1177 1178 1179 1180 1181 1182
	xfrm_pol_put(xp);

	return 0;
}

static int copy_to_user_tmpl(struct xfrm_policy *xp, struct sk_buff *skb)
{
	struct xfrm_user_tmpl vec[XFRM_MAX_DEPTH];
	int i;

	if (xp->xfrm_nr == 0)
		return 0;

	for (i = 0; i < xp->xfrm_nr; i++) {
		struct xfrm_user_tmpl *up = &vec[i];
		struct xfrm_tmpl *kp = &xp->xfrm_vec[i];

		memcpy(&up->id, &kp->id, sizeof(up->id));
1183
		up->family = kp->encap_family;
L
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		memcpy(&up->saddr, &kp->saddr, sizeof(up->saddr));
		up->reqid = kp->reqid;
		up->mode = kp->mode;
		up->share = kp->share;
		up->optional = kp->optional;
		up->aalgos = kp->aalgos;
		up->ealgos = kp->ealgos;
		up->calgos = kp->calgos;
	}
	RTA_PUT(skb, XFRMA_TMPL,
		(sizeof(struct xfrm_user_tmpl) * xp->xfrm_nr),
		vec);

	return 0;

rtattr_failure:
	return -1;
}

1203
static int copy_sec_ctx(struct xfrm_sec_ctx *s, struct sk_buff *skb)
1204
{
1205 1206 1207 1208 1209 1210 1211 1212 1213 1214
	int ctx_size = sizeof(struct xfrm_sec_ctx) + s->ctx_len;
	struct rtattr *rt = __RTA_PUT(skb, XFRMA_SEC_CTX, ctx_size);
	struct xfrm_user_sec_ctx *uctx = RTA_DATA(rt);

	uctx->exttype = XFRMA_SEC_CTX;
	uctx->len = ctx_size;
	uctx->ctx_doi = s->ctx_doi;
	uctx->ctx_alg = s->ctx_alg;
	uctx->ctx_len = s->ctx_len;
	memcpy(uctx + 1, s->ctx_str, s->ctx_len);
1215
	return 0;
1216

1217 1218 1219 1220 1221 1222 1223 1224
 rtattr_failure:
	return -1;
}

static inline int copy_to_user_state_sec_ctx(struct xfrm_state *x, struct sk_buff *skb)
{
	if (x->security) {
		return copy_sec_ctx(x->security, skb);
1225 1226
	}
	return 0;
1227
}
1228

1229 1230 1231 1232 1233 1234
static inline int copy_to_user_sec_ctx(struct xfrm_policy *xp, struct sk_buff *skb)
{
	if (xp->security) {
		return copy_sec_ctx(xp->security, skb);
	}
	return 0;
1235 1236
}

1237
#ifdef CONFIG_XFRM_SUB_POLICY
1238
static int copy_to_user_policy_type(u8 type, struct sk_buff *skb)
1239 1240 1241 1242
{
	struct xfrm_userpolicy_type upt;

	memset(&upt, 0, sizeof(upt));
1243
	upt.type = type;
1244 1245 1246 1247 1248 1249 1250 1251 1252 1253

	RTA_PUT(skb, XFRMA_POLICY_TYPE, sizeof(upt), &upt);

	return 0;

rtattr_failure:
	return -1;
}

#else
1254
static inline int copy_to_user_policy_type(u8 type, struct sk_buff *skb)
1255 1256 1257 1258 1259
{
	return 0;
}
#endif

L
Linus Torvalds 已提交
1260 1261 1262 1263 1264 1265 1266
static int dump_one_policy(struct xfrm_policy *xp, int dir, int count, void *ptr)
{
	struct xfrm_dump_info *sp = ptr;
	struct xfrm_userpolicy_info *p;
	struct sk_buff *in_skb = sp->in_skb;
	struct sk_buff *skb = sp->out_skb;
	struct nlmsghdr *nlh;
1267
	unsigned char *b = skb_tail_pointer(skb);
L
Linus Torvalds 已提交
1268 1269 1270 1271 1272 1273 1274 1275 1276 1277 1278 1279 1280

	if (sp->this_idx < sp->start_idx)
		goto out;

	nlh = NLMSG_PUT(skb, NETLINK_CB(in_skb).pid,
			sp->nlmsg_seq,
			XFRM_MSG_NEWPOLICY, sizeof(*p));
	p = NLMSG_DATA(nlh);
	nlh->nlmsg_flags = sp->nlmsg_flags;

	copy_to_user_policy(xp, p, dir);
	if (copy_to_user_tmpl(xp, skb) < 0)
		goto nlmsg_failure;
1281 1282
	if (copy_to_user_sec_ctx(xp, skb))
		goto nlmsg_failure;
1283
	if (copy_to_user_policy_type(xp->type, skb) < 0)
1284
		goto nlmsg_failure;
L
Linus Torvalds 已提交
1285

1286
	nlh->nlmsg_len = skb_tail_pointer(skb) - b;
L
Linus Torvalds 已提交
1287 1288 1289 1290 1291
out:
	sp->this_idx++;
	return 0;

nlmsg_failure:
1292
	nlmsg_trim(skb, b);
L
Linus Torvalds 已提交
1293 1294 1295 1296 1297 1298 1299 1300 1301 1302 1303 1304 1305
	return -1;
}

static int xfrm_dump_policy(struct sk_buff *skb, struct netlink_callback *cb)
{
	struct xfrm_dump_info info;

	info.in_skb = cb->skb;
	info.out_skb = skb;
	info.nlmsg_seq = cb->nlh->nlmsg_seq;
	info.nlmsg_flags = NLM_F_MULTI;
	info.this_idx = 0;
	info.start_idx = cb->args[0];
1306 1307 1308 1309
	(void) xfrm_policy_walk(XFRM_POLICY_TYPE_MAIN, dump_one_policy, &info);
#ifdef CONFIG_XFRM_SUB_POLICY
	(void) xfrm_policy_walk(XFRM_POLICY_TYPE_SUB, dump_one_policy, &info);
#endif
L
Linus Torvalds 已提交
1310 1311 1312 1313 1314 1315 1316 1317 1318 1319 1320 1321 1322 1323 1324 1325 1326 1327 1328 1329 1330 1331 1332 1333 1334 1335 1336 1337 1338 1339
	cb->args[0] = info.this_idx;

	return skb->len;
}

static struct sk_buff *xfrm_policy_netlink(struct sk_buff *in_skb,
					  struct xfrm_policy *xp,
					  int dir, u32 seq)
{
	struct xfrm_dump_info info;
	struct sk_buff *skb;

	skb = alloc_skb(NLMSG_GOODSIZE, GFP_KERNEL);
	if (!skb)
		return ERR_PTR(-ENOMEM);

	info.in_skb = in_skb;
	info.out_skb = skb;
	info.nlmsg_seq = seq;
	info.nlmsg_flags = 0;
	info.this_idx = info.start_idx = 0;

	if (dump_one_policy(xp, dir, 0, &info) < 0) {
		kfree_skb(skb);
		return NULL;
	}

	return skb;
}

1340 1341
static int xfrm_get_policy(struct sk_buff *skb, struct nlmsghdr *nlh,
		struct rtattr **xfrma)
L
Linus Torvalds 已提交
1342 1343 1344
{
	struct xfrm_policy *xp;
	struct xfrm_userpolicy_id *p;
1345
	u8 type = XFRM_POLICY_TYPE_MAIN;
L
Linus Torvalds 已提交
1346
	int err;
1347
	struct km_event c;
L
Linus Torvalds 已提交
1348 1349 1350 1351 1352
	int delete;

	p = NLMSG_DATA(nlh);
	delete = nlh->nlmsg_type == XFRM_MSG_DELPOLICY;

1353
	err = copy_from_user_policy_type(&type, xfrma);
1354 1355 1356
	if (err)
		return err;

L
Linus Torvalds 已提交
1357 1358 1359 1360 1361
	err = verify_policy_dir(p->dir);
	if (err)
		return err;

	if (p->index)
1362
		xp = xfrm_policy_byid(type, p->dir, p->index, delete, &err);
1363
	else {
1364
		struct rtattr *rt = xfrma[XFRMA_SEC_CTX-1];
1365 1366
		struct xfrm_policy tmp;

1367
		err = verify_sec_ctx_len(xfrma);
1368 1369 1370 1371 1372 1373 1374 1375 1376 1377
		if (err)
			return err;

		memset(&tmp, 0, sizeof(struct xfrm_policy));
		if (rt) {
			struct xfrm_user_sec_ctx *uctx = RTA_DATA(rt);

			if ((err = security_xfrm_policy_alloc(&tmp, uctx)))
				return err;
		}
1378 1379
		xp = xfrm_policy_bysel_ctx(type, p->dir, &p->sel, tmp.security,
					   delete, &err);
1380 1381
		security_xfrm_policy_free(&tmp);
	}
L
Linus Torvalds 已提交
1382 1383 1384 1385 1386 1387 1388 1389 1390 1391 1392 1393 1394 1395
	if (xp == NULL)
		return -ENOENT;

	if (!delete) {
		struct sk_buff *resp_skb;

		resp_skb = xfrm_policy_netlink(skb, xp, p->dir, nlh->nlmsg_seq);
		if (IS_ERR(resp_skb)) {
			err = PTR_ERR(resp_skb);
		} else {
			err = netlink_unicast(xfrm_nl, resp_skb,
					      NETLINK_CB(skb).pid,
					      MSG_DONTWAIT);
		}
1396
	} else {
1397 1398 1399 1400
		xfrm_audit_log(NETLINK_CB(skb).loginuid, NETLINK_CB(skb).sid,
			       AUDIT_MAC_IPSEC_DELSPD, err ? 0 : 1, xp, NULL);

		if (err != 0)
C
Catherine Zhang 已提交
1401
			goto out;
1402

1403
		c.data.byid = p->index;
1404
		c.event = nlh->nlmsg_type;
1405 1406 1407
		c.seq = nlh->nlmsg_seq;
		c.pid = nlh->nlmsg_pid;
		km_policy_notify(xp, p->dir, &c);
L
Linus Torvalds 已提交
1408 1409
	}

C
Catherine Zhang 已提交
1410
out:
1411
	xfrm_pol_put(xp);
L
Linus Torvalds 已提交
1412 1413 1414
	return err;
}

1415 1416
static int xfrm_flush_sa(struct sk_buff *skb, struct nlmsghdr *nlh,
		struct rtattr **xfrma)
L
Linus Torvalds 已提交
1417
{
1418
	struct km_event c;
L
Linus Torvalds 已提交
1419
	struct xfrm_usersa_flush *p = NLMSG_DATA(nlh);
J
Joy Latten 已提交
1420
	struct xfrm_audit audit_info;
L
Linus Torvalds 已提交
1421

J
Joy Latten 已提交
1422 1423 1424
	audit_info.loginuid = NETLINK_CB(skb).loginuid;
	audit_info.secid = NETLINK_CB(skb).sid;
	xfrm_state_flush(p->proto, &audit_info);
1425
	c.data.proto = p->proto;
1426
	c.event = nlh->nlmsg_type;
1427 1428 1429 1430
	c.seq = nlh->nlmsg_seq;
	c.pid = nlh->nlmsg_pid;
	km_state_notify(NULL, &c);

L
Linus Torvalds 已提交
1431 1432 1433
	return 0;
}

J
Jamal Hadi Salim 已提交
1434 1435 1436 1437 1438 1439

static int build_aevent(struct sk_buff *skb, struct xfrm_state *x, struct km_event *c)
{
	struct xfrm_aevent_id *id;
	struct nlmsghdr *nlh;
	struct xfrm_lifetime_cur ltime;
1440
	unsigned char *b = skb_tail_pointer(skb);
J
Jamal Hadi Salim 已提交
1441 1442 1443 1444 1445

	nlh = NLMSG_PUT(skb, c->pid, c->seq, XFRM_MSG_NEWAE, sizeof(*id));
	id = NLMSG_DATA(nlh);
	nlh->nlmsg_flags = 0;

1446
	memcpy(&id->sa_id.daddr, &x->id.daddr,sizeof(x->id.daddr));
J
Jamal Hadi Salim 已提交
1447 1448 1449
	id->sa_id.spi = x->id.spi;
	id->sa_id.family = x->props.family;
	id->sa_id.proto = x->id.proto;
1450 1451
	memcpy(&id->saddr, &x->props.saddr,sizeof(x->props.saddr));
	id->reqid = x->props.reqid;
J
Jamal Hadi Salim 已提交
1452 1453 1454 1455 1456 1457 1458 1459 1460 1461 1462 1463 1464 1465 1466 1467 1468 1469 1470 1471
	id->flags = c->data.aevent;

	RTA_PUT(skb, XFRMA_REPLAY_VAL, sizeof(x->replay), &x->replay);

	ltime.bytes = x->curlft.bytes;
	ltime.packets = x->curlft.packets;
	ltime.add_time = x->curlft.add_time;
	ltime.use_time = x->curlft.use_time;

	RTA_PUT(skb, XFRMA_LTIME_VAL, sizeof(struct xfrm_lifetime_cur), &ltime);

	if (id->flags&XFRM_AE_RTHR) {
		RTA_PUT(skb,XFRMA_REPLAY_THRESH,sizeof(u32),&x->replay_maxdiff);
	}

	if (id->flags&XFRM_AE_ETHR) {
		u32 etimer = x->replay_maxage*10/HZ;
		RTA_PUT(skb,XFRMA_ETIMER_THRESH,sizeof(u32),&etimer);
	}

1472
	nlh->nlmsg_len = skb_tail_pointer(skb) - b;
J
Jamal Hadi Salim 已提交
1473 1474 1475 1476
	return skb->len;

rtattr_failure:
nlmsg_failure:
1477
	nlmsg_trim(skb, b);
J
Jamal Hadi Salim 已提交
1478 1479 1480
	return -1;
}

1481 1482
static int xfrm_get_ae(struct sk_buff *skb, struct nlmsghdr *nlh,
		struct rtattr **xfrma)
J
Jamal Hadi Salim 已提交
1483 1484 1485 1486 1487 1488 1489 1490 1491 1492 1493 1494 1495 1496 1497 1498 1499 1500 1501 1502 1503 1504 1505 1506
{
	struct xfrm_state *x;
	struct sk_buff *r_skb;
	int err;
	struct km_event c;
	struct xfrm_aevent_id *p = NLMSG_DATA(nlh);
	int len = NLMSG_LENGTH(sizeof(struct xfrm_aevent_id));
	struct xfrm_usersa_id *id = &p->sa_id;

	len += RTA_SPACE(sizeof(struct xfrm_replay_state));
	len += RTA_SPACE(sizeof(struct xfrm_lifetime_cur));

	if (p->flags&XFRM_AE_RTHR)
		len+=RTA_SPACE(sizeof(u32));

	if (p->flags&XFRM_AE_ETHR)
		len+=RTA_SPACE(sizeof(u32));

	r_skb = alloc_skb(len, GFP_ATOMIC);
	if (r_skb == NULL)
		return -ENOMEM;

	x = xfrm_state_lookup(&id->daddr, id->spi, id->proto, id->family);
	if (x == NULL) {
P
Patrick McHardy 已提交
1507
		kfree_skb(r_skb);
J
Jamal Hadi Salim 已提交
1508 1509 1510 1511 1512 1513 1514 1515 1516 1517 1518 1519 1520 1521 1522 1523 1524 1525 1526 1527 1528 1529
		return -ESRCH;
	}

	/*
	 * XXX: is this lock really needed - none of the other
	 * gets lock (the concern is things getting updated
	 * while we are still reading) - jhs
	*/
	spin_lock_bh(&x->lock);
	c.data.aevent = p->flags;
	c.seq = nlh->nlmsg_seq;
	c.pid = nlh->nlmsg_pid;

	if (build_aevent(r_skb, x, &c) < 0)
		BUG();
	err = netlink_unicast(xfrm_nl, r_skb,
			      NETLINK_CB(skb).pid, MSG_DONTWAIT);
	spin_unlock_bh(&x->lock);
	xfrm_state_put(x);
	return err;
}

1530 1531
static int xfrm_new_ae(struct sk_buff *skb, struct nlmsghdr *nlh,
		struct rtattr **xfrma)
J
Jamal Hadi Salim 已提交
1532 1533 1534 1535 1536 1537 1538 1539 1540 1541 1542 1543 1544 1545 1546 1547 1548 1549 1550 1551 1552 1553 1554
{
	struct xfrm_state *x;
	struct km_event c;
	int err = - EINVAL;
	struct xfrm_aevent_id *p = NLMSG_DATA(nlh);
	struct rtattr *rp = xfrma[XFRMA_REPLAY_VAL-1];
	struct rtattr *lt = xfrma[XFRMA_LTIME_VAL-1];

	if (!lt && !rp)
		return err;

	/* pedantic mode - thou shalt sayeth replaceth */
	if (!(nlh->nlmsg_flags&NLM_F_REPLACE))
		return err;

	x = xfrm_state_lookup(&p->sa_id.daddr, p->sa_id.spi, p->sa_id.proto, p->sa_id.family);
	if (x == NULL)
		return -ESRCH;

	if (x->km.state != XFRM_STATE_VALID)
		goto out;

	spin_lock_bh(&x->lock);
1555
	err = xfrm_update_ae_params(x, xfrma);
J
Jamal Hadi Salim 已提交
1556 1557 1558 1559 1560 1561 1562 1563 1564 1565 1566 1567 1568 1569 1570
	spin_unlock_bh(&x->lock);
	if (err	< 0)
		goto out;

	c.event = nlh->nlmsg_type;
	c.seq = nlh->nlmsg_seq;
	c.pid = nlh->nlmsg_pid;
	c.data.aevent = XFRM_AE_CU;
	km_state_notify(x, &c);
	err = 0;
out:
	xfrm_state_put(x);
	return err;
}

1571 1572
static int xfrm_flush_policy(struct sk_buff *skb, struct nlmsghdr *nlh,
		struct rtattr **xfrma)
L
Linus Torvalds 已提交
1573
{
1574
	struct km_event c;
1575
	u8 type = XFRM_POLICY_TYPE_MAIN;
1576
	int err;
J
Joy Latten 已提交
1577
	struct xfrm_audit audit_info;
1578

1579
	err = copy_from_user_policy_type(&type, xfrma);
1580 1581
	if (err)
		return err;
1582

J
Joy Latten 已提交
1583 1584 1585
	audit_info.loginuid = NETLINK_CB(skb).loginuid;
	audit_info.secid = NETLINK_CB(skb).sid;
	xfrm_policy_flush(type, &audit_info);
1586
	c.data.type = type;
1587
	c.event = nlh->nlmsg_type;
1588 1589 1590
	c.seq = nlh->nlmsg_seq;
	c.pid = nlh->nlmsg_pid;
	km_policy_notify(NULL, 0, &c);
L
Linus Torvalds 已提交
1591 1592 1593
	return 0;
}

1594 1595
static int xfrm_add_pol_expire(struct sk_buff *skb, struct nlmsghdr *nlh,
		struct rtattr **xfrma)
1596 1597 1598 1599
{
	struct xfrm_policy *xp;
	struct xfrm_user_polexpire *up = NLMSG_DATA(nlh);
	struct xfrm_userpolicy_info *p = &up->pol;
1600
	u8 type = XFRM_POLICY_TYPE_MAIN;
1601 1602
	int err = -ENOENT;

1603
	err = copy_from_user_policy_type(&type, xfrma);
1604 1605 1606
	if (err)
		return err;

1607
	if (p->index)
1608
		xp = xfrm_policy_byid(type, p->dir, p->index, 0, &err);
1609
	else {
1610
		struct rtattr *rt = xfrma[XFRMA_SEC_CTX-1];
1611 1612
		struct xfrm_policy tmp;

1613
		err = verify_sec_ctx_len(xfrma);
1614 1615 1616 1617 1618 1619 1620 1621 1622 1623
		if (err)
			return err;

		memset(&tmp, 0, sizeof(struct xfrm_policy));
		if (rt) {
			struct xfrm_user_sec_ctx *uctx = RTA_DATA(rt);

			if ((err = security_xfrm_policy_alloc(&tmp, uctx)))
				return err;
		}
1624 1625
		xp = xfrm_policy_bysel_ctx(type, p->dir, &p->sel, tmp.security,
					   0, &err);
1626 1627 1628 1629
		security_xfrm_policy_free(&tmp);
	}

	if (xp == NULL)
1630 1631
		return -ENOENT;
	read_lock(&xp->lock);
1632 1633 1634 1635 1636 1637 1638 1639 1640
	if (xp->dead) {
		read_unlock(&xp->lock);
		goto out;
	}

	read_unlock(&xp->lock);
	err = 0;
	if (up->hard) {
		xfrm_policy_delete(xp, p->dir);
J
Joy Latten 已提交
1641 1642 1643
		xfrm_audit_log(NETLINK_CB(skb).loginuid, NETLINK_CB(skb).sid,
				AUDIT_MAC_IPSEC_DELSPD, 1, xp, NULL);

1644 1645 1646 1647 1648 1649 1650 1651 1652 1653 1654
	} else {
		// reset the timers here?
		printk("Dont know what to do with soft policy expire\n");
	}
	km_policy_expired(xp, p->dir, up->hard, current->pid);

out:
	xfrm_pol_put(xp);
	return err;
}

1655 1656
static int xfrm_add_sa_expire(struct sk_buff *skb, struct nlmsghdr *nlh,
		struct rtattr **xfrma)
1657 1658 1659 1660 1661 1662 1663 1664
{
	struct xfrm_state *x;
	int err;
	struct xfrm_user_expire *ue = NLMSG_DATA(nlh);
	struct xfrm_usersa_info *p = &ue->state;

	x = xfrm_state_lookup(&p->id.daddr, p->id.spi, p->id.proto, p->family);

1665
	err = -ENOENT;
1666 1667 1668 1669
	if (x == NULL)
		return err;

	spin_lock_bh(&x->lock);
1670
	err = -EINVAL;
1671 1672 1673 1674
	if (x->km.state != XFRM_STATE_VALID)
		goto out;
	km_state_expired(x, ue->hard, current->pid);

J
Joy Latten 已提交
1675
	if (ue->hard) {
1676
		__xfrm_state_delete(x);
J
Joy Latten 已提交
1677 1678 1679
		xfrm_audit_log(NETLINK_CB(skb).loginuid, NETLINK_CB(skb).sid,
			       AUDIT_MAC_IPSEC_DELSA, 1, NULL, x);
	}
1680
	err = 0;
1681 1682 1683 1684 1685 1686
out:
	spin_unlock_bh(&x->lock);
	xfrm_state_put(x);
	return err;
}

1687 1688
static int xfrm_add_acquire(struct sk_buff *skb, struct nlmsghdr *nlh,
		struct rtattr **xfrma)
1689 1690 1691 1692 1693 1694 1695 1696 1697 1698 1699 1700 1701 1702 1703 1704 1705 1706 1707 1708 1709
{
	struct xfrm_policy *xp;
	struct xfrm_user_tmpl *ut;
	int i;
	struct rtattr *rt = xfrma[XFRMA_TMPL-1];

	struct xfrm_user_acquire *ua = NLMSG_DATA(nlh);
	struct xfrm_state *x = xfrm_state_alloc();
	int err = -ENOMEM;

	if (!x)
		return err;

	err = verify_newpolicy_info(&ua->policy);
	if (err) {
		printk("BAD policy passed\n");
		kfree(x);
		return err;
	}

	/*   build an XP */
1710 1711
	xp = xfrm_policy_construct(&ua->policy, (struct rtattr **) xfrma, &err);
	if (!xp) {
1712 1713 1714 1715 1716 1717 1718 1719 1720 1721 1722 1723 1724 1725 1726 1727 1728 1729 1730 1731 1732 1733 1734 1735 1736 1737 1738 1739 1740
		kfree(x);
		return err;
	}

	memcpy(&x->id, &ua->id, sizeof(ua->id));
	memcpy(&x->props.saddr, &ua->saddr, sizeof(ua->saddr));
	memcpy(&x->sel, &ua->sel, sizeof(ua->sel));

	ut = RTA_DATA(rt);
	/* extract the templates and for each call km_key */
	for (i = 0; i < xp->xfrm_nr; i++, ut++) {
		struct xfrm_tmpl *t = &xp->xfrm_vec[i];
		memcpy(&x->id, &t->id, sizeof(x->id));
		x->props.mode = t->mode;
		x->props.reqid = t->reqid;
		x->props.family = ut->family;
		t->aalgos = ua->aalgos;
		t->ealgos = ua->ealgos;
		t->calgos = ua->calgos;
		err = km_query(x, t, xp);

	}

	kfree(x);
	kfree(xp);

	return 0;
}

1741 1742 1743 1744 1745 1746 1747 1748 1749 1750 1751 1752 1753 1754 1755 1756 1757 1758 1759 1760 1761 1762 1763 1764 1765 1766 1767 1768 1769 1770 1771 1772 1773 1774 1775 1776 1777 1778 1779 1780 1781 1782 1783 1784 1785 1786 1787 1788 1789 1790 1791 1792 1793 1794 1795 1796 1797 1798 1799 1800 1801 1802 1803 1804 1805 1806 1807 1808 1809 1810 1811 1812 1813 1814 1815 1816 1817 1818 1819 1820 1821 1822 1823 1824 1825 1826 1827 1828 1829 1830 1831 1832 1833 1834 1835 1836 1837 1838 1839 1840 1841 1842 1843 1844 1845 1846 1847 1848 1849 1850 1851 1852 1853
#ifdef CONFIG_XFRM_MIGRATE
static int verify_user_migrate(struct rtattr **xfrma)
{
	struct rtattr *rt = xfrma[XFRMA_MIGRATE-1];
	struct xfrm_user_migrate *um;

	if (!rt)
		return -EINVAL;

	if ((rt->rta_len - sizeof(*rt)) < sizeof(*um))
		return -EINVAL;

	return 0;
}

static int copy_from_user_migrate(struct xfrm_migrate *ma,
				  struct rtattr **xfrma, int *num)
{
	struct rtattr *rt = xfrma[XFRMA_MIGRATE-1];
	struct xfrm_user_migrate *um;
	int i, num_migrate;

	um = RTA_DATA(rt);
	num_migrate = (rt->rta_len - sizeof(*rt)) / sizeof(*um);

	if (num_migrate <= 0 || num_migrate > XFRM_MAX_DEPTH)
		return -EINVAL;

	for (i = 0; i < num_migrate; i++, um++, ma++) {
		memcpy(&ma->old_daddr, &um->old_daddr, sizeof(ma->old_daddr));
		memcpy(&ma->old_saddr, &um->old_saddr, sizeof(ma->old_saddr));
		memcpy(&ma->new_daddr, &um->new_daddr, sizeof(ma->new_daddr));
		memcpy(&ma->new_saddr, &um->new_saddr, sizeof(ma->new_saddr));

		ma->proto = um->proto;
		ma->mode = um->mode;
		ma->reqid = um->reqid;

		ma->old_family = um->old_family;
		ma->new_family = um->new_family;
	}

	*num = i;
	return 0;
}

static int xfrm_do_migrate(struct sk_buff *skb, struct nlmsghdr *nlh,
			   struct rtattr **xfrma)
{
	struct xfrm_userpolicy_id *pi = NLMSG_DATA(nlh);
	struct xfrm_migrate m[XFRM_MAX_DEPTH];
	u8 type;
	int err;
	int n = 0;

	err = verify_user_migrate((struct rtattr **)xfrma);
	if (err)
		return err;

	err = copy_from_user_policy_type(&type, (struct rtattr **)xfrma);
	if (err)
		return err;

	err = copy_from_user_migrate((struct xfrm_migrate *)m,
				     (struct rtattr **)xfrma, &n);
	if (err)
		return err;

	if (!n)
		return 0;

	xfrm_migrate(&pi->sel, pi->dir, type, m, n);

	return 0;
}
#else
static int xfrm_do_migrate(struct sk_buff *skb, struct nlmsghdr *nlh,
			   struct rtattr **xfrma)
{
	return -ENOPROTOOPT;
}
#endif

#ifdef CONFIG_XFRM_MIGRATE
static int copy_to_user_migrate(struct xfrm_migrate *m, struct sk_buff *skb)
{
	struct xfrm_user_migrate um;

	memset(&um, 0, sizeof(um));
	um.proto = m->proto;
	um.mode = m->mode;
	um.reqid = m->reqid;
	um.old_family = m->old_family;
	memcpy(&um.old_daddr, &m->old_daddr, sizeof(um.old_daddr));
	memcpy(&um.old_saddr, &m->old_saddr, sizeof(um.old_saddr));
	um.new_family = m->new_family;
	memcpy(&um.new_daddr, &m->new_daddr, sizeof(um.new_daddr));
	memcpy(&um.new_saddr, &m->new_saddr, sizeof(um.new_saddr));

	RTA_PUT(skb, XFRMA_MIGRATE, sizeof(um), &um);
	return 0;

rtattr_failure:
	return -1;
}

static int build_migrate(struct sk_buff *skb, struct xfrm_migrate *m,
			 int num_migrate, struct xfrm_selector *sel,
			 u8 dir, u8 type)
{
	struct xfrm_migrate *mp;
	struct xfrm_userpolicy_id *pol_id;
	struct nlmsghdr *nlh;
1854
	unsigned char *b = skb_tail_pointer(skb);
1855 1856 1857 1858 1859 1860 1861 1862 1863 1864 1865 1866 1867 1868 1869 1870 1871 1872 1873
	int i;

	nlh = NLMSG_PUT(skb, 0, 0, XFRM_MSG_MIGRATE, sizeof(*pol_id));
	pol_id = NLMSG_DATA(nlh);
	nlh->nlmsg_flags = 0;

	/* copy data from selector, dir, and type to the pol_id */
	memset(pol_id, 0, sizeof(*pol_id));
	memcpy(&pol_id->sel, sel, sizeof(pol_id->sel));
	pol_id->dir = dir;

	if (copy_to_user_policy_type(type, skb) < 0)
		goto nlmsg_failure;

	for (i = 0, mp = m ; i < num_migrate; i++, mp++) {
		if (copy_to_user_migrate(mp, skb) < 0)
			goto nlmsg_failure;
	}

1874
	nlh->nlmsg_len = skb_tail_pointer(skb) - b;
1875 1876
	return skb->len;
nlmsg_failure:
1877
	nlmsg_trim(skb, b);
1878 1879 1880 1881 1882 1883 1884 1885 1886 1887 1888 1889 1890 1891 1892 1893 1894 1895 1896 1897 1898 1899 1900 1901 1902 1903 1904 1905 1906 1907 1908 1909 1910
	return -1;
}

static int xfrm_send_migrate(struct xfrm_selector *sel, u8 dir, u8 type,
			     struct xfrm_migrate *m, int num_migrate)
{
	struct sk_buff *skb;
	size_t len;

	len = RTA_SPACE(sizeof(struct xfrm_user_migrate) * num_migrate);
	len += NLMSG_SPACE(sizeof(struct xfrm_userpolicy_id));
#ifdef CONFIG_XFRM_SUB_POLICY
	len += RTA_SPACE(sizeof(struct xfrm_userpolicy_type));
#endif
	skb = alloc_skb(len, GFP_ATOMIC);
	if (skb == NULL)
		return -ENOMEM;

	/* build migrate */
	if (build_migrate(skb, m, num_migrate, sel, dir, type) < 0)
		BUG();

	NETLINK_CB(skb).dst_group = XFRMNLGRP_MIGRATE;
	return netlink_broadcast(xfrm_nl, skb, 0, XFRMNLGRP_MIGRATE,
				 GFP_ATOMIC);
}
#else
static int xfrm_send_migrate(struct xfrm_selector *sel, u8 dir, u8 type,
			     struct xfrm_migrate *m, int num_migrate)
{
	return -ENOPROTOOPT;
}
#endif
J
Jamal Hadi Salim 已提交
1911

1912 1913 1914 1915 1916 1917 1918 1919 1920 1921
#define XMSGSIZE(type) NLMSG_LENGTH(sizeof(struct type))

static const int xfrm_msg_min[XFRM_NR_MSGTYPES] = {
	[XFRM_MSG_NEWSA       - XFRM_MSG_BASE] = XMSGSIZE(xfrm_usersa_info),
	[XFRM_MSG_DELSA       - XFRM_MSG_BASE] = XMSGSIZE(xfrm_usersa_id),
	[XFRM_MSG_GETSA       - XFRM_MSG_BASE] = XMSGSIZE(xfrm_usersa_id),
	[XFRM_MSG_NEWPOLICY   - XFRM_MSG_BASE] = XMSGSIZE(xfrm_userpolicy_info),
	[XFRM_MSG_DELPOLICY   - XFRM_MSG_BASE] = XMSGSIZE(xfrm_userpolicy_id),
	[XFRM_MSG_GETPOLICY   - XFRM_MSG_BASE] = XMSGSIZE(xfrm_userpolicy_id),
	[XFRM_MSG_ALLOCSPI    - XFRM_MSG_BASE] = XMSGSIZE(xfrm_userspi_info),
1922
	[XFRM_MSG_ACQUIRE     - XFRM_MSG_BASE] = XMSGSIZE(xfrm_user_acquire),
1923
	[XFRM_MSG_EXPIRE      - XFRM_MSG_BASE] = XMSGSIZE(xfrm_user_expire),
1924 1925
	[XFRM_MSG_UPDPOLICY   - XFRM_MSG_BASE] = XMSGSIZE(xfrm_userpolicy_info),
	[XFRM_MSG_UPDSA       - XFRM_MSG_BASE] = XMSGSIZE(xfrm_usersa_info),
1926
	[XFRM_MSG_POLEXPIRE   - XFRM_MSG_BASE] = XMSGSIZE(xfrm_user_polexpire),
1927 1928
	[XFRM_MSG_FLUSHSA     - XFRM_MSG_BASE] = XMSGSIZE(xfrm_usersa_flush),
	[XFRM_MSG_FLUSHPOLICY - XFRM_MSG_BASE] = NLMSG_LENGTH(0),
J
Jamal Hadi Salim 已提交
1929 1930
	[XFRM_MSG_NEWAE       - XFRM_MSG_BASE] = XMSGSIZE(xfrm_aevent_id),
	[XFRM_MSG_GETAE       - XFRM_MSG_BASE] = XMSGSIZE(xfrm_aevent_id),
1931
	[XFRM_MSG_REPORT      - XFRM_MSG_BASE] = XMSGSIZE(xfrm_user_report),
1932
	[XFRM_MSG_MIGRATE     - XFRM_MSG_BASE] = XMSGSIZE(xfrm_userpolicy_id),
1933
	[XFRM_MSG_GETSADINFO  - XFRM_MSG_BASE] = NLMSG_LENGTH(sizeof(u32)),
J
Jamal Hadi Salim 已提交
1934
	[XFRM_MSG_GETSPDINFO  - XFRM_MSG_BASE] = NLMSG_LENGTH(sizeof(u32)),
L
Linus Torvalds 已提交
1935 1936
};

1937 1938
#undef XMSGSIZE

L
Linus Torvalds 已提交
1939
static struct xfrm_link {
1940
	int (*doit)(struct sk_buff *, struct nlmsghdr *, struct rtattr **);
L
Linus Torvalds 已提交
1941
	int (*dump)(struct sk_buff *, struct netlink_callback *);
1942 1943 1944 1945 1946 1947 1948 1949 1950 1951
} xfrm_dispatch[XFRM_NR_MSGTYPES] = {
	[XFRM_MSG_NEWSA       - XFRM_MSG_BASE] = { .doit = xfrm_add_sa        },
	[XFRM_MSG_DELSA       - XFRM_MSG_BASE] = { .doit = xfrm_del_sa        },
	[XFRM_MSG_GETSA       - XFRM_MSG_BASE] = { .doit = xfrm_get_sa,
						   .dump = xfrm_dump_sa       },
	[XFRM_MSG_NEWPOLICY   - XFRM_MSG_BASE] = { .doit = xfrm_add_policy    },
	[XFRM_MSG_DELPOLICY   - XFRM_MSG_BASE] = { .doit = xfrm_get_policy    },
	[XFRM_MSG_GETPOLICY   - XFRM_MSG_BASE] = { .doit = xfrm_get_policy,
						   .dump = xfrm_dump_policy   },
	[XFRM_MSG_ALLOCSPI    - XFRM_MSG_BASE] = { .doit = xfrm_alloc_userspi },
1952
	[XFRM_MSG_ACQUIRE     - XFRM_MSG_BASE] = { .doit = xfrm_add_acquire   },
1953
	[XFRM_MSG_EXPIRE      - XFRM_MSG_BASE] = { .doit = xfrm_add_sa_expire },
1954 1955
	[XFRM_MSG_UPDPOLICY   - XFRM_MSG_BASE] = { .doit = xfrm_add_policy    },
	[XFRM_MSG_UPDSA       - XFRM_MSG_BASE] = { .doit = xfrm_add_sa        },
1956
	[XFRM_MSG_POLEXPIRE   - XFRM_MSG_BASE] = { .doit = xfrm_add_pol_expire},
1957 1958
	[XFRM_MSG_FLUSHSA     - XFRM_MSG_BASE] = { .doit = xfrm_flush_sa      },
	[XFRM_MSG_FLUSHPOLICY - XFRM_MSG_BASE] = { .doit = xfrm_flush_policy  },
J
Jamal Hadi Salim 已提交
1959 1960
	[XFRM_MSG_NEWAE       - XFRM_MSG_BASE] = { .doit = xfrm_new_ae  },
	[XFRM_MSG_GETAE       - XFRM_MSG_BASE] = { .doit = xfrm_get_ae  },
1961
	[XFRM_MSG_MIGRATE     - XFRM_MSG_BASE] = { .doit = xfrm_do_migrate    },
1962
	[XFRM_MSG_GETSADINFO  - XFRM_MSG_BASE] = { .doit = xfrm_get_sadinfo   },
J
Jamal Hadi Salim 已提交
1963
	[XFRM_MSG_GETSPDINFO  - XFRM_MSG_BASE] = { .doit = xfrm_get_spdinfo   },
L
Linus Torvalds 已提交
1964 1965
};

1966
static int xfrm_user_rcv_msg(struct sk_buff *skb, struct nlmsghdr *nlh)
L
Linus Torvalds 已提交
1967 1968 1969
{
	struct rtattr *xfrma[XFRMA_MAX];
	struct xfrm_link *link;
1970
	int type, min_len;
L
Linus Torvalds 已提交
1971 1972 1973

	type = nlh->nlmsg_type;
	if (type > XFRM_MSG_MAX)
1974
		return -EINVAL;
L
Linus Torvalds 已提交
1975 1976 1977 1978 1979

	type -= XFRM_MSG_BASE;
	link = &xfrm_dispatch[type];

	/* All operations require privileges, even GET */
1980 1981
	if (security_netlink_recv(skb, CAP_NET_ADMIN))
		return -EPERM;
L
Linus Torvalds 已提交
1982

1983 1984 1985
	if ((type == (XFRM_MSG_GETSA - XFRM_MSG_BASE) ||
	     type == (XFRM_MSG_GETPOLICY - XFRM_MSG_BASE)) &&
	    (nlh->nlmsg_flags & NLM_F_DUMP)) {
L
Linus Torvalds 已提交
1986
		if (link->dump == NULL)
1987
			return -EINVAL;
1988

1989
		return netlink_dump_start(xfrm_nl, skb, nlh, link->dump, NULL);
L
Linus Torvalds 已提交
1990 1991 1992 1993 1994
	}

	memset(xfrma, 0, sizeof(xfrma));

	if (nlh->nlmsg_len < (min_len = xfrm_msg_min[type]))
1995
		return -EINVAL;
L
Linus Torvalds 已提交
1996 1997 1998 1999 2000 2001 2002 2003 2004

	if (nlh->nlmsg_len > min_len) {
		int attrlen = nlh->nlmsg_len - NLMSG_ALIGN(min_len);
		struct rtattr *attr = (void *) nlh + NLMSG_ALIGN(min_len);

		while (RTA_OK(attr, attrlen)) {
			unsigned short flavor = attr->rta_type;
			if (flavor) {
				if (flavor > XFRMA_MAX)
2005
					return -EINVAL;
L
Linus Torvalds 已提交
2006 2007 2008 2009 2010 2011 2012
				xfrma[flavor - 1] = attr;
			}
			attr = RTA_NEXT(attr, attrlen);
		}
	}

	if (link->doit == NULL)
2013
		return -EINVAL;
L
Linus Torvalds 已提交
2014

2015
	return link->doit(skb, nlh, xfrma);
L
Linus Torvalds 已提交
2016 2017 2018 2019
}

static void xfrm_netlink_rcv(struct sock *sk, int len)
{
2020
	unsigned int qlen = 0;
2021

L
Linus Torvalds 已提交
2022
	do {
A
Arjan van de Ven 已提交
2023
		mutex_lock(&xfrm_cfg_mutex);
2024
		netlink_run_queue(sk, &qlen, &xfrm_user_rcv_msg);
A
Arjan van de Ven 已提交
2025
		mutex_unlock(&xfrm_cfg_mutex);
L
Linus Torvalds 已提交
2026

2027
	} while (qlen);
L
Linus Torvalds 已提交
2028 2029
}

J
Jamal Hadi Salim 已提交
2030
static int build_expire(struct sk_buff *skb, struct xfrm_state *x, struct km_event *c)
L
Linus Torvalds 已提交
2031 2032 2033
{
	struct xfrm_user_expire *ue;
	struct nlmsghdr *nlh;
2034
	unsigned char *b = skb_tail_pointer(skb);
L
Linus Torvalds 已提交
2035

J
Jamal Hadi Salim 已提交
2036
	nlh = NLMSG_PUT(skb, c->pid, 0, XFRM_MSG_EXPIRE,
L
Linus Torvalds 已提交
2037 2038 2039 2040 2041
			sizeof(*ue));
	ue = NLMSG_DATA(nlh);
	nlh->nlmsg_flags = 0;

	copy_to_user_state(x, &ue->state);
J
Jamal Hadi Salim 已提交
2042
	ue->hard = (c->data.hard != 0) ? 1 : 0;
L
Linus Torvalds 已提交
2043

2044
	nlh->nlmsg_len = skb_tail_pointer(skb) - b;
L
Linus Torvalds 已提交
2045 2046 2047
	return skb->len;

nlmsg_failure:
2048
	nlmsg_trim(skb, b);
L
Linus Torvalds 已提交
2049 2050 2051
	return -1;
}

2052
static int xfrm_exp_state_notify(struct xfrm_state *x, struct km_event *c)
L
Linus Torvalds 已提交
2053 2054
{
	struct sk_buff *skb;
2055
	int len = NLMSG_LENGTH(sizeof(struct xfrm_user_expire));
L
Linus Torvalds 已提交
2056

2057
	skb = alloc_skb(len, GFP_ATOMIC);
L
Linus Torvalds 已提交
2058 2059 2060
	if (skb == NULL)
		return -ENOMEM;

J
Jamal Hadi Salim 已提交
2061
	if (build_expire(skb, x, c) < 0)
L
Linus Torvalds 已提交
2062 2063
		BUG();

2064 2065
	NETLINK_CB(skb).dst_group = XFRMNLGRP_EXPIRE;
	return netlink_broadcast(xfrm_nl, skb, 0, XFRMNLGRP_EXPIRE, GFP_ATOMIC);
L
Linus Torvalds 已提交
2066 2067
}

J
Jamal Hadi Salim 已提交
2068 2069 2070 2071 2072 2073 2074 2075 2076 2077 2078 2079 2080 2081 2082 2083 2084 2085
static int xfrm_aevent_state_notify(struct xfrm_state *x, struct km_event *c)
{
	struct sk_buff *skb;
	int len = NLMSG_LENGTH(sizeof(struct xfrm_aevent_id));

	len += RTA_SPACE(sizeof(struct xfrm_replay_state));
	len += RTA_SPACE(sizeof(struct xfrm_lifetime_cur));
	skb = alloc_skb(len, GFP_ATOMIC);
	if (skb == NULL)
		return -ENOMEM;

	if (build_aevent(skb, x, c) < 0)
		BUG();

	NETLINK_CB(skb).dst_group = XFRMNLGRP_AEVENTS;
	return netlink_broadcast(xfrm_nl, skb, 0, XFRMNLGRP_AEVENTS, GFP_ATOMIC);
}

2086 2087 2088 2089 2090
static int xfrm_notify_sa_flush(struct km_event *c)
{
	struct xfrm_usersa_flush *p;
	struct nlmsghdr *nlh;
	struct sk_buff *skb;
2091
	sk_buff_data_t b;
2092 2093 2094 2095 2096 2097 2098 2099 2100 2101 2102 2103
	int len = NLMSG_LENGTH(sizeof(struct xfrm_usersa_flush));

	skb = alloc_skb(len, GFP_ATOMIC);
	if (skb == NULL)
		return -ENOMEM;
	b = skb->tail;

	nlh = NLMSG_PUT(skb, c->pid, c->seq,
			XFRM_MSG_FLUSHSA, sizeof(*p));
	nlh->nlmsg_flags = 0;

	p = NLMSG_DATA(nlh);
2104
	p->proto = c->data.proto;
2105 2106 2107

	nlh->nlmsg_len = skb->tail - b;

2108 2109
	NETLINK_CB(skb).dst_group = XFRMNLGRP_SA;
	return netlink_broadcast(xfrm_nl, skb, 0, XFRMNLGRP_SA, GFP_ATOMIC);
2110 2111 2112 2113 2114 2115

nlmsg_failure:
	kfree_skb(skb);
	return -1;
}

D
Dave Jones 已提交
2116
static inline int xfrm_sa_len(struct xfrm_state *x)
2117
{
2118
	int l = 0;
2119 2120 2121 2122 2123 2124 2125 2126 2127 2128 2129 2130 2131 2132 2133
	if (x->aalg)
		l += RTA_SPACE(sizeof(*x->aalg) + (x->aalg->alg_key_len+7)/8);
	if (x->ealg)
		l += RTA_SPACE(sizeof(*x->ealg) + (x->ealg->alg_key_len+7)/8);
	if (x->calg)
		l += RTA_SPACE(sizeof(*x->calg));
	if (x->encap)
		l += RTA_SPACE(sizeof(*x->encap));

	return l;
}

static int xfrm_notify_sa(struct xfrm_state *x, struct km_event *c)
{
	struct xfrm_usersa_info *p;
2134
	struct xfrm_usersa_id *id;
2135 2136
	struct nlmsghdr *nlh;
	struct sk_buff *skb;
2137
	sk_buff_data_t b;
2138
	int len = xfrm_sa_len(x);
2139 2140 2141 2142 2143 2144 2145 2146
	int headlen;

	headlen = sizeof(*p);
	if (c->event == XFRM_MSG_DELSA) {
		len += RTA_SPACE(headlen);
		headlen = sizeof(*id);
	}
	len += NLMSG_SPACE(headlen);
2147 2148 2149 2150 2151 2152

	skb = alloc_skb(len, GFP_ATOMIC);
	if (skb == NULL)
		return -ENOMEM;
	b = skb->tail;

2153
	nlh = NLMSG_PUT(skb, c->pid, c->seq, c->event, headlen);
2154 2155 2156
	nlh->nlmsg_flags = 0;

	p = NLMSG_DATA(nlh);
2157 2158 2159 2160 2161 2162 2163 2164 2165 2166
	if (c->event == XFRM_MSG_DELSA) {
		id = NLMSG_DATA(nlh);
		memcpy(&id->daddr, &x->id.daddr, sizeof(id->daddr));
		id->spi = x->id.spi;
		id->family = x->props.family;
		id->proto = x->id.proto;

		p = RTA_DATA(__RTA_PUT(skb, XFRMA_SA, sizeof(*p)));
	}

2167 2168 2169 2170 2171 2172 2173 2174 2175 2176 2177 2178 2179 2180 2181 2182
	copy_to_user_state(x, p);

	if (x->aalg)
		RTA_PUT(skb, XFRMA_ALG_AUTH,
			sizeof(*(x->aalg))+(x->aalg->alg_key_len+7)/8, x->aalg);
	if (x->ealg)
		RTA_PUT(skb, XFRMA_ALG_CRYPT,
			sizeof(*(x->ealg))+(x->ealg->alg_key_len+7)/8, x->ealg);
	if (x->calg)
		RTA_PUT(skb, XFRMA_ALG_COMP, sizeof(*(x->calg)), x->calg);

	if (x->encap)
		RTA_PUT(skb, XFRMA_ENCAP, sizeof(*x->encap), x->encap);

	nlh->nlmsg_len = skb->tail - b;

2183 2184
	NETLINK_CB(skb).dst_group = XFRMNLGRP_SA;
	return netlink_broadcast(xfrm_nl, skb, 0, XFRMNLGRP_SA, GFP_ATOMIC);
2185 2186 2187 2188 2189 2190 2191 2192 2193 2194 2195

nlmsg_failure:
rtattr_failure:
	kfree_skb(skb);
	return -1;
}

static int xfrm_send_state_notify(struct xfrm_state *x, struct km_event *c)
{

	switch (c->event) {
2196
	case XFRM_MSG_EXPIRE:
2197
		return xfrm_exp_state_notify(x, c);
J
Jamal Hadi Salim 已提交
2198 2199
	case XFRM_MSG_NEWAE:
		return xfrm_aevent_state_notify(x, c);
2200 2201 2202
	case XFRM_MSG_DELSA:
	case XFRM_MSG_UPDSA:
	case XFRM_MSG_NEWSA:
2203
		return xfrm_notify_sa(x, c);
2204
	case XFRM_MSG_FLUSHSA:
2205 2206 2207 2208 2209 2210 2211 2212 2213 2214
		return xfrm_notify_sa_flush(c);
	default:
		 printk("xfrm_user: Unknown SA event %d\n", c->event);
		 break;
	}

	return 0;

}

L
Linus Torvalds 已提交
2215 2216 2217 2218 2219 2220
static int build_acquire(struct sk_buff *skb, struct xfrm_state *x,
			 struct xfrm_tmpl *xt, struct xfrm_policy *xp,
			 int dir)
{
	struct xfrm_user_acquire *ua;
	struct nlmsghdr *nlh;
2221
	unsigned char *b = skb_tail_pointer(skb);
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2222 2223 2224 2225 2226 2227 2228 2229 2230 2231 2232 2233 2234 2235 2236 2237 2238 2239
	__u32 seq = xfrm_get_acqseq();

	nlh = NLMSG_PUT(skb, 0, 0, XFRM_MSG_ACQUIRE,
			sizeof(*ua));
	ua = NLMSG_DATA(nlh);
	nlh->nlmsg_flags = 0;

	memcpy(&ua->id, &x->id, sizeof(ua->id));
	memcpy(&ua->saddr, &x->props.saddr, sizeof(ua->saddr));
	memcpy(&ua->sel, &x->sel, sizeof(ua->sel));
	copy_to_user_policy(xp, &ua->policy, dir);
	ua->aalgos = xt->aalgos;
	ua->ealgos = xt->ealgos;
	ua->calgos = xt->calgos;
	ua->seq = x->km.seq = seq;

	if (copy_to_user_tmpl(xp, skb) < 0)
		goto nlmsg_failure;
2240
	if (copy_to_user_state_sec_ctx(x, skb))
2241
		goto nlmsg_failure;
2242
	if (copy_to_user_policy_type(xp->type, skb) < 0)
2243
		goto nlmsg_failure;
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2244

2245
	nlh->nlmsg_len = skb_tail_pointer(skb) - b;
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	return skb->len;

nlmsg_failure:
2249
	nlmsg_trim(skb, b);
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	return -1;
}

static int xfrm_send_acquire(struct xfrm_state *x, struct xfrm_tmpl *xt,
			     struct xfrm_policy *xp, int dir)
{
	struct sk_buff *skb;
	size_t len;

	len = RTA_SPACE(sizeof(struct xfrm_user_tmpl) * xp->xfrm_nr);
	len += NLMSG_SPACE(sizeof(struct xfrm_user_acquire));
2261
	len += RTA_SPACE(xfrm_user_sec_ctx_size(x->security));
2262 2263 2264
#ifdef CONFIG_XFRM_SUB_POLICY
	len += RTA_SPACE(sizeof(struct xfrm_userpolicy_type));
#endif
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	skb = alloc_skb(len, GFP_ATOMIC);
	if (skb == NULL)
		return -ENOMEM;

	if (build_acquire(skb, x, xt, xp, dir) < 0)
		BUG();

2272 2273
	NETLINK_CB(skb).dst_group = XFRMNLGRP_ACQUIRE;
	return netlink_broadcast(xfrm_nl, skb, 0, XFRMNLGRP_ACQUIRE, GFP_ATOMIC);
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}

/* User gives us xfrm_user_policy_info followed by an array of 0
 * or more templates.
 */
2279
static struct xfrm_policy *xfrm_compile_policy(struct sock *sk, int opt,
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					       u8 *data, int len, int *dir)
{
	struct xfrm_userpolicy_info *p = (struct xfrm_userpolicy_info *)data;
	struct xfrm_user_tmpl *ut = (struct xfrm_user_tmpl *) (p + 1);
	struct xfrm_policy *xp;
	int nr;

2287
	switch (sk->sk_family) {
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2288 2289 2290 2291 2292 2293 2294 2295 2296 2297 2298 2299 2300 2301 2302 2303 2304 2305 2306 2307 2308 2309 2310 2311 2312 2313
	case AF_INET:
		if (opt != IP_XFRM_POLICY) {
			*dir = -EOPNOTSUPP;
			return NULL;
		}
		break;
#if defined(CONFIG_IPV6) || defined(CONFIG_IPV6_MODULE)
	case AF_INET6:
		if (opt != IPV6_XFRM_POLICY) {
			*dir = -EOPNOTSUPP;
			return NULL;
		}
		break;
#endif
	default:
		*dir = -EINVAL;
		return NULL;
	}

	*dir = -EINVAL;

	if (len < sizeof(*p) ||
	    verify_newpolicy_info(p))
		return NULL;

	nr = ((len - sizeof(*p)) / sizeof(*ut));
2314
	if (validate_tmpl(nr, ut, p->sel.family))
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		return NULL;

2317 2318 2319
	if (p->dir > XFRM_POLICY_OUT)
		return NULL;

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	xp = xfrm_policy_alloc(GFP_KERNEL);
	if (xp == NULL) {
		*dir = -ENOBUFS;
		return NULL;
	}

	copy_from_user_policy(xp, p);
2327
	xp->type = XFRM_POLICY_TYPE_MAIN;
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	copy_templates(xp, ut, nr);

	*dir = p->dir;

	return xp;
}

static int build_polexpire(struct sk_buff *skb, struct xfrm_policy *xp,
J
Jamal Hadi Salim 已提交
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			   int dir, struct km_event *c)
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2337 2338 2339
{
	struct xfrm_user_polexpire *upe;
	struct nlmsghdr *nlh;
J
Jamal Hadi Salim 已提交
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	int hard = c->data.hard;
2341
	unsigned char *b = skb_tail_pointer(skb);
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Linus Torvalds 已提交
2342

J
Jamal Hadi Salim 已提交
2343
	nlh = NLMSG_PUT(skb, c->pid, 0, XFRM_MSG_POLEXPIRE, sizeof(*upe));
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	upe = NLMSG_DATA(nlh);
	nlh->nlmsg_flags = 0;

	copy_to_user_policy(xp, &upe->pol, dir);
	if (copy_to_user_tmpl(xp, skb) < 0)
		goto nlmsg_failure;
2350 2351
	if (copy_to_user_sec_ctx(xp, skb))
		goto nlmsg_failure;
2352
	if (copy_to_user_policy_type(xp->type, skb) < 0)
2353
		goto nlmsg_failure;
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2354 2355
	upe->hard = !!hard;

2356
	nlh->nlmsg_len = skb_tail_pointer(skb) - b;
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	return skb->len;

nlmsg_failure:
2360
	nlmsg_trim(skb, b);
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	return -1;
}

2364
static int xfrm_exp_policy_notify(struct xfrm_policy *xp, int dir, struct km_event *c)
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{
	struct sk_buff *skb;
	size_t len;

	len = RTA_SPACE(sizeof(struct xfrm_user_tmpl) * xp->xfrm_nr);
	len += NLMSG_SPACE(sizeof(struct xfrm_user_polexpire));
2371
	len += RTA_SPACE(xfrm_user_sec_ctx_size(xp->security));
2372 2373 2374
#ifdef CONFIG_XFRM_SUB_POLICY
	len += RTA_SPACE(sizeof(struct xfrm_userpolicy_type));
#endif
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2375 2376 2377 2378
	skb = alloc_skb(len, GFP_ATOMIC);
	if (skb == NULL)
		return -ENOMEM;

J
Jamal Hadi Salim 已提交
2379
	if (build_polexpire(skb, xp, dir, c) < 0)
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2380 2381
		BUG();

2382 2383
	NETLINK_CB(skb).dst_group = XFRMNLGRP_EXPIRE;
	return netlink_broadcast(xfrm_nl, skb, 0, XFRMNLGRP_EXPIRE, GFP_ATOMIC);
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}

2386 2387 2388
static int xfrm_notify_policy(struct xfrm_policy *xp, int dir, struct km_event *c)
{
	struct xfrm_userpolicy_info *p;
2389
	struct xfrm_userpolicy_id *id;
2390 2391
	struct nlmsghdr *nlh;
	struct sk_buff *skb;
2392
	sk_buff_data_t b;
2393
	int len = RTA_SPACE(sizeof(struct xfrm_user_tmpl) * xp->xfrm_nr);
2394 2395 2396 2397 2398 2399 2400
	int headlen;

	headlen = sizeof(*p);
	if (c->event == XFRM_MSG_DELPOLICY) {
		len += RTA_SPACE(headlen);
		headlen = sizeof(*id);
	}
2401 2402 2403
#ifdef CONFIG_XFRM_SUB_POLICY
	len += RTA_SPACE(sizeof(struct xfrm_userpolicy_type));
#endif
2404
	len += NLMSG_SPACE(headlen);
2405 2406 2407 2408 2409 2410

	skb = alloc_skb(len, GFP_ATOMIC);
	if (skb == NULL)
		return -ENOMEM;
	b = skb->tail;

2411
	nlh = NLMSG_PUT(skb, c->pid, c->seq, c->event, headlen);
2412 2413

	p = NLMSG_DATA(nlh);
2414 2415 2416 2417 2418 2419 2420 2421 2422 2423 2424
	if (c->event == XFRM_MSG_DELPOLICY) {
		id = NLMSG_DATA(nlh);
		memset(id, 0, sizeof(*id));
		id->dir = dir;
		if (c->data.byid)
			id->index = xp->index;
		else
			memcpy(&id->sel, &xp->selector, sizeof(id->sel));

		p = RTA_DATA(__RTA_PUT(skb, XFRMA_POLICY, sizeof(*p)));
	}
2425 2426 2427 2428 2429 2430

	nlh->nlmsg_flags = 0;

	copy_to_user_policy(xp, p, dir);
	if (copy_to_user_tmpl(xp, skb) < 0)
		goto nlmsg_failure;
2431
	if (copy_to_user_policy_type(xp->type, skb) < 0)
2432
		goto nlmsg_failure;
2433 2434 2435

	nlh->nlmsg_len = skb->tail - b;

2436 2437
	NETLINK_CB(skb).dst_group = XFRMNLGRP_POLICY;
	return netlink_broadcast(xfrm_nl, skb, 0, XFRMNLGRP_POLICY, GFP_ATOMIC);
2438 2439

nlmsg_failure:
2440
rtattr_failure:
2441 2442 2443 2444 2445 2446 2447 2448
	kfree_skb(skb);
	return -1;
}

static int xfrm_notify_policy_flush(struct km_event *c)
{
	struct nlmsghdr *nlh;
	struct sk_buff *skb;
2449
	sk_buff_data_t b;
2450
	int len = 0;
2451
#ifdef CONFIG_XFRM_SUB_POLICY
2452
	len += RTA_SPACE(sizeof(struct xfrm_userpolicy_type));
2453
#endif
2454
	len += NLMSG_LENGTH(0);
2455 2456 2457 2458 2459 2460 2461 2462

	skb = alloc_skb(len, GFP_ATOMIC);
	if (skb == NULL)
		return -ENOMEM;
	b = skb->tail;


	nlh = NLMSG_PUT(skb, c->pid, c->seq, XFRM_MSG_FLUSHPOLICY, 0);
2463
	nlh->nlmsg_flags = 0;
2464 2465
	if (copy_to_user_policy_type(c->data.type, skb) < 0)
		goto nlmsg_failure;
2466 2467 2468

	nlh->nlmsg_len = skb->tail - b;

2469 2470
	NETLINK_CB(skb).dst_group = XFRMNLGRP_POLICY;
	return netlink_broadcast(xfrm_nl, skb, 0, XFRMNLGRP_POLICY, GFP_ATOMIC);
2471 2472 2473 2474 2475 2476 2477 2478 2479 2480

nlmsg_failure:
	kfree_skb(skb);
	return -1;
}

static int xfrm_send_policy_notify(struct xfrm_policy *xp, int dir, struct km_event *c)
{

	switch (c->event) {
2481 2482 2483
	case XFRM_MSG_NEWPOLICY:
	case XFRM_MSG_UPDPOLICY:
	case XFRM_MSG_DELPOLICY:
2484
		return xfrm_notify_policy(xp, dir, c);
2485
	case XFRM_MSG_FLUSHPOLICY:
2486
		return xfrm_notify_policy_flush(c);
2487
	case XFRM_MSG_POLEXPIRE:
2488 2489 2490 2491 2492 2493 2494 2495 2496
		return xfrm_exp_policy_notify(xp, dir, c);
	default:
		printk("xfrm_user: Unknown Policy event %d\n", c->event);
	}

	return 0;

}

2497 2498 2499 2500 2501
static int build_report(struct sk_buff *skb, u8 proto,
			struct xfrm_selector *sel, xfrm_address_t *addr)
{
	struct xfrm_user_report *ur;
	struct nlmsghdr *nlh;
2502
	unsigned char *b = skb_tail_pointer(skb);
2503 2504 2505 2506 2507 2508 2509 2510 2511 2512 2513

	nlh = NLMSG_PUT(skb, 0, 0, XFRM_MSG_REPORT, sizeof(*ur));
	ur = NLMSG_DATA(nlh);
	nlh->nlmsg_flags = 0;

	ur->proto = proto;
	memcpy(&ur->sel, sel, sizeof(ur->sel));

	if (addr)
		RTA_PUT(skb, XFRMA_COADDR, sizeof(*addr), addr);

2514
	nlh->nlmsg_len = skb_tail_pointer(skb) - b;
2515 2516 2517 2518
	return skb->len;

nlmsg_failure:
rtattr_failure:
2519
	nlmsg_trim(skb, b);
2520 2521 2522 2523 2524 2525 2526 2527 2528 2529 2530 2531 2532 2533 2534 2535 2536 2537 2538 2539 2540
	return -1;
}

static int xfrm_send_report(u8 proto, struct xfrm_selector *sel,
			    xfrm_address_t *addr)
{
	struct sk_buff *skb;
	size_t len;

	len = NLMSG_ALIGN(NLMSG_LENGTH(sizeof(struct xfrm_user_report)));
	skb = alloc_skb(len, GFP_ATOMIC);
	if (skb == NULL)
		return -ENOMEM;

	if (build_report(skb, proto, sel, addr) < 0)
		BUG();

	NETLINK_CB(skb).dst_group = XFRMNLGRP_REPORT;
	return netlink_broadcast(xfrm_nl, skb, 0, XFRMNLGRP_REPORT, GFP_ATOMIC);
}

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Linus Torvalds 已提交
2541 2542 2543 2544 2545 2546
static struct xfrm_mgr netlink_mgr = {
	.id		= "netlink",
	.notify		= xfrm_send_state_notify,
	.acquire	= xfrm_send_acquire,
	.compile_policy	= xfrm_compile_policy,
	.notify_policy	= xfrm_send_policy_notify,
2547
	.report		= xfrm_send_report,
2548
	.migrate	= xfrm_send_migrate,
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Linus Torvalds 已提交
2549 2550 2551 2552
};

static int __init xfrm_user_init(void)
{
2553 2554
	struct sock *nlsk;

2555
	printk(KERN_INFO "Initializing XFRM netlink socket\n");
L
Linus Torvalds 已提交
2556

2557
	nlsk = netlink_kernel_create(NETLINK_XFRM, XFRMNLGRP_MAX,
2558
				     xfrm_netlink_rcv, NULL, THIS_MODULE);
2559
	if (nlsk == NULL)
L
Linus Torvalds 已提交
2560
		return -ENOMEM;
2561
	rcu_assign_pointer(xfrm_nl, nlsk);
L
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2562 2563 2564 2565 2566 2567 2568 2569

	xfrm_register_km(&netlink_mgr);

	return 0;
}

static void __exit xfrm_user_exit(void)
{
2570 2571
	struct sock *nlsk = xfrm_nl;

L
Linus Torvalds 已提交
2572
	xfrm_unregister_km(&netlink_mgr);
2573 2574 2575
	rcu_assign_pointer(xfrm_nl, NULL);
	synchronize_rcu();
	sock_release(nlsk->sk_socket);
L
Linus Torvalds 已提交
2576 2577 2578 2579 2580
}

module_init(xfrm_user_init);
module_exit(xfrm_user_exit);
MODULE_LICENSE("GPL");
2581
MODULE_ALIAS_NET_PF_PROTO(PF_NETLINK, NETLINK_XFRM);
2582